I found most of these links from reddit (source) and thought I will share and save it to my blog as future reference. There are many new that I have not check it out as well as many old ones that I had forgotten.
http://www.grooveshark.com – For listening to music.
http://www.printfriendly.com – Makes any page printer-friendly.
http://www.ted.com – Interesting and informational videos on a whole range of topics.
http://www.stumbleupon.com – Finds websites based on what you’re interested in and how other people’s ratings.
http://www.slickdeals.net – For finding good deals/freebies/contests.
http://www.bugmenot.com – Usernames/passwords for sites requiring registration.
http://www.mailinator.com – Temporary e-mail for when you want to sign up for something and not get spammed.
http://www.google.com/cse?cx=003849996876419856805:erhhdbygrma&ie=UTF-8&q=&sa=Search – Google torrent search
http://www.pipl.com – Looking up people based on username, name, email, or phone #.
http://ocw.mit.edu/OcwWeb/web/home/home/index.htm – MIT OpenCourseWare – entire courses, often including lecture videos available for free online.
http://ninite.com/ – Great website to create an installation package of applications for when you’re reinstalling your OS or have just purchased a new computer.
http://www.retailmenot.com – Coupons
http://www.kayak.com – Awesome site for when you’re planning a trip.
http://www.nophonetrees.com/ – Get directly in touch with a human when you’re calling customer service/support.
http://www.scribd.com – Ebook search.
http://www.ovguide.com – Search engine for movies/tv shows.
http://www.tineye.com – Reverse image search.
http://downforeveryoneorjustme.com/ – self-explanatory.
http://www.popurls.com – link aggregator.
http://www.gethighnow.com – audio and video illusions.
http://tvtropes.org – “Tropes are devices and conventions that a writer can reasonably rely on as being present in the audience members’ minds and expectations. On the whole, tropes are not clichés. The word clichéd means “stereotyped and trite”. In other words, dull and uninteresting. We are not looking for dull and uninteresting entries. We are here to recognize tropes and play with them, not to make fun of them.”
http://www.meetup.com – Meet up with a local group that share your interests.
http://meebo.com – Web-based chat without downloading the actual client (AIM, Yahoo, MSN, etc.)
http://www.boston.com/bigpicture – Amazing, high-quality, pictures from around the world.
http://simple.wikipedia.org/wiki/Main_Page – Wikipedia – in layman’s terms.
http://opendns.org – Safer surfing. Can block sites and protect your network.
http://studyblue.com – Great site to get notes/past exams for college students.
http://www.whatismyip.com – Tells you your IP address.
http://mp3cut.net/ – Cutting/splitting mp3s.
http://ceevee.com/ – Build/maintain a resume.
http://www.cutmypic.com/ – Crop a picture.
http://www.mygazines.net/ – Magazines online.
http://tinychat.com – Create a chatroom. Has web-cam and microphone support.
http://www.mint.com/ – Money management.
http://www.deviantart.com – For anything art-related. Good site to get wallpapers.
http://www.whatshouldireadnext.com/search – Gives you book suggestions based on books you’ve liked before.
http://woot.com – Posts one good deal per day.
http://www.filleritem.com/ – Finds filler items for Amazon so you have enough to get free shipping.
http://fantasti.cc – aggregates most Porn 2.0 sites
http://labs.google.com/sets – Looking for more parts of a set of words (i.e. Entering Mars, Earth, Venus, Jupiter will yield Saturn AND MAYBE PLUTO)
http://chir.ag/projects/tip-of-my-tongue/ – GOOD LORD MAN WHAT IS THAT WORD. Well now you know.
http://www.whois.net/ – Finding the WHOIS info of a domain
http://www.tastespotting.com/ – Amazing food and amazing recipes with amazing pictures. Go indulge your mental stomach while you plan on indulging your physical one.
http://www.whosampled.com/ – Who sampled what music
http://downforeveryoneorjustme.com/ – Is that website down for every-ah you get it
http://www.synchtube.com/ – Watch youtube with your friends (syncs youtube between multiple viewers)
http://www.livemocha.com/ – Learn a new language.
http://passcracking.ru/ – Crack hashes.
http://www.allrecipes.com – Best recipe site I know
http://tutsplus.com/ – tutorials for a bunch of adobe design programs
http://colorschemedesigner.com/ – useful for website color schemes
http://www.smashingmagazine.com/ – design blog
https://thepiratebay.org/ – While it lasts
http://www.dropbox.com – Free service that syncs a folder on your computer to an online data store.
http://network-tools.com Pings, trace routes, dns lookups, dns reverse lookups, whois (domain name owner details, ip address owner details). A total swiss army knife of uh, network tools.
http://delicious.com/ – social bookmarking
www.gigapedia.org: ebooks (for those hard to find textbooks).
www.metacritic.com : aggregrate movies/films/games ratings from all major critics.
http://pandora.com – Another great free music site. Unlike Grooveshark, you can’t freely play any song you want, but it has a fantastic algorithm for discovering similar music so it takes a lot less effort to set it up to play a wide variety of things I like – no need to pick out lots and lots of songs from the catalog beforehand. Yes, Grooveshark does have that same radio feature, but it’s sorely lacking.
http://www.gutenberg.org – for a transcript of any book written before copyright laws. Includes some semi-professional volunteer audiobooks.
http://www.spanishdict.com – as a Spanish major, I’ve found this to be the best and most complete Spanish-English dictionary if you’re looking for a thorough and clear definition.
http://tvshack.net/ has lots of tv shows and movies for streaming. I use a proxy to get around the hour viewing restrictions that some of the shows have.
http://pixlr.com (fixed) I stopped using photoshop since I found this.
http://www.blindtextgenerator.com/lorem-ipsum – Dummy text generator.
http://dummyimage.com/ – Dummy Image Generator.
http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html – Adobe Flash player configuration.
http://www.reemst.com/calvinandhobbes/stripsearch – Calvin and Hobbes Extensive Strip Search.
http://challonge.com/ – Tournament Bracket Generator.
http://www.doihaveadeadpixel.com/ – Do I Have A Dead Pixel.
http://accidentsketch.com/ – Accident sketching online.
http://www.freemaptools.com/ – Maps you can make use of…
http://radiotuna.com/ – Discover Online Radio.
http://www.gazopa.com/ – Discover similar pictures.
http://errorlevelanalysis.com/ – Image Error Level Analyzer.
http://www.rainymood.com/ – Rainy Mood.
http://subreddits.0fees.net/comment_stats.htm – Reddit Comment Statistics.
http://www.radioreddit.com:8000/ – Reddit Radio.
http://subredditfinder.com/ – Sub-Reddit Finder.
http://www.visca.com/regexdict/ – Regex Dictionary.
http://www.gskinner.com/RegExr/ – OnLine Regex Testing Tool.
http://scr.im/ – Convert your email address into a short, cute and safe link you can share it more safely.
http://showmewhatswrong.com/ – Instant screen recordings.
http://www.subs.to/ – Search Subtitles.
http://www.youtube.com/disco – YouTube Music Discovery Project and Playlist Creation Tool.
http://www.wikimapia.com – Satellite maps with explanations, tags, links
http://www.marinetraffic.com – Every ship at sea right now
http://www.radioreference.com – Live police & emergency scanner traffic
http://www.flightaware.com – Every IFR airplane airborne in US airspace
http://www.liveatc.net – Live Air Traffic Control radio monitor
http://www.airliners.net – Photos of almost every aircraft in existence
http://www.the506.com/nflmaps – NFL games broadcast map
http://www.gifexplode.com – separate an animated GIF into its component images