I just wanted to add my voice to all the posts about ReSharper's memory leaks. Eventually Visual Studio becomes unusable and very slow between keystrokes. In my case, VS + R# stops being usable at about 600MB of VM Size. I'll probably have to uninstall. To work w/ files w/ lots of Windows Forms controls I already have to turn off highlighting. I also get R# crashes w/ OutOfMemoryExceptions on a regular basis (which I report). My machine as 2 GB physical memory btw.
Anyway, I like all the concepts that R# is trying for, it's just that the implementation needs a lot of work, esp. w/ memory management.