Here I'm posting a short list of cool extensions I found for VS2010, all are published in the Visual Studio Gallery
Reactive Extensions for VS2010
http://visualstudiogallery.msdn.microsoft.com/en-us/0791089a-4570-4f21-b5ee-78aba7e80651 Tangible T4 Editor (Template editor for VS2010)http://visualstudiogallery.msdn.microsoft.com/en-us/60297607-5fd4-4da4-97e1-3715e90c1a23 Power Commands for VS2010http://visualstudiogallery.msdn.microsoft.com/en-us/e5f41ad9-4edc-4912-bca3-91147db95b99 Atomlineer Comment Generation for VS2010http://visualstudiogallery.msdn.microsoft.com/en-us/7912CCF4-60B8-4132-BACE-5ACACEB7233B Goto Definition Extension for VS2010http://visualstudiogallery.msdn.microsoft.com/en-us/4b286b9c-4dd5-416b-b143-e31d36dc622b Resource Refactoring for VS2010http://visualstudiogallery.msdn.microsoft.com/en-us/39ae29d3-81e1-43d4-9c48-fc9644869d84 TFS PowerTools for VS2010http://visualstudiogallery.msdn.microsoft.com/en-us/0e69a28f-020c-488b-80b3-f4c89a20621d
Enjoy!
Andres G Vettori, VMBC, CTO