I’ll second Jeff LaMarche’s comments on XCode 4. (via WWDC).  Very very impressive.

Since I have much more experience with Visual Studio (as it stares me in the face waiting for me to get back to work), I can easily compare the two. I think VS is a great mature tool for its .NET genre. I’ll have to state from what I saw of the preview (and that’s all I can say) it has caught up and even surpassed VS. Nice work Apple. Now if they only dump that ObjectiveC 😉