I knew right where my "Build" folder was in Xcode 3 and my "Release" or "AppStore" or "Debug" builds were right in there, plain and simple. Now with Xcode 4:
Where the frack are they in Xcode 4???
Fear not, Xcode 4 (default settings) uses a common build or derived data folder.
I put a shortcut to this folder in my "DevWork" folder for quick and easy access.
That's for this post, by all means if you find something interesting about Xcode 4 or have something you'd like me to cover, just send me an email of the @gmail.com type to meachware or post a comment on one of the Xcode 4 posts.