Xcode 4.0.1 is now available
Apple has released Xcode 4.0.1 today. It's largely a bug fix release. Specific changes include:
Improved Assistant editor logic when switching among different file types
Fixed a bug in "Install Xcode.app" that hangs at 99% complete, never finishing
Fixed a bug that prevented indexing of some projects
Fixed a bug related to nil settings in the Core Data model editor
Fixed a bug that prevented automatic download of iOS documentation
Fixed a bug in LLVM GCC 4.2 and LLVM compiler 2.0 for iOS projects
Additional bug fixes and stability improvements
You can grab your copy via the Mac App Store or Apple's site. Happy coding.