ReSharper: It's too hard to go without
The cats at JetBrains imply that ReSharper 3.0 works in VS2008, but really, well, not so much. It seems to have a hard time seeing properties in a code behind of objects on the page. I swear I remember encountering that in 2005 as well, but I don't remember how it got resolved.
Anyway, turning it off reminds me how incomplete Visual Studio really is without it. I mean, you get zero indication if you've got something in your code that doesn't work until you try to build. I'm talking about the goofy stuff like misspelling a class. When it doesn't turn red, that's just weird now. Seriously, I'm not sure how I got along without ReSharper. Ever.
One of the guys I work with seems to know every strange key combination to get things done quickly with ReSharper, and I'm not quite there, but even the basics make such a huge difference in doing things quickly, and doing them the right way. I will gladly fork over whatever money they want for the product. Please, just get that EAP release out soon. It's hard to live without!