Product site for our upcoming calendaring application is now released. Check out yourself http://www.dotnetcal.com.
I wrote site in PHP and I am using MovableType Personal Publishing System in backend. Check out speed how fast pages are loaded. Site runs on FreeBSD server at USA, Atlanta. Database naturally is MySQL.
Thought these pages are temporal pages, hopefully in spring I will make final pages with some extranet functionality for our customers. Therefore I will write pages on .NET because there is more need to interaction with backend. I am not very confident in PHP when it comes to more advanced logics but for basic website it’s really nice/easy/fast language to work with. :)