MbUnit: my new prefered Test framework
RhinoMocks 3.5: Liking the new syntax
MassTransit: Even if just for making Asynch and MSMQ easier
Suteki: ASP.Net MVC CMS (can i get any more TLAs in there?), I'm currently trying to port from MVC3 to MVC 5, but the demos look cool.
MVC Contrib: Even if its just so i can bolt Castle in .. so sweet!
NAnt: I still havent had any reason to move to the "cooler" *ake tools as Nant is just easy.
Things that are not Cool:
I hate both of you. :p