Resharper is one of those tools that once you start using it, its addictive. I'm not talking, “gee this is a really nice feature” addictive, but “what namespace is this class in? Resharper will remind me” addictive. Not to sound too much like a commercial for them, but its a really great product that everyone should try--- but be warned, I'm not kidding on the addictive part; if you can't use it at work, but may be better off not trying it.
And now version two, a beta tech preview, is out supporting both VS 2003 and VS 2005 Beta IDE's and frameworks. Check out the details and download from here.