Apparently I installed the Chripy Add-In for Visual Studio 2010, it does appear in the Add-In manager, I did configure the Coffee-Script path to my local coffee.exe file, but still nothing shows up in Visual Studio, when I add a .coffee file to the MVC3 project (in the script folder).
I just downloaded the current version of Chirpy from Codeplex (ver 2.01) and experienced the same issue. Using this guide from Weirdlover, you will note that in step 2 he suggests that one adds a .chirpy.coffee file. The problem is that the add-in is pre-configure to look for .chirp.coffee (Tools -> Options -> Chirpy ->CoffeeScript), notice the lack of a 'y'. You can either change the Chirpy options or rename your file.