Okay, I might be a little bit fangrrlish about the new Xcode 4 IDE. But seriously, it's really an awesome update to the existing Xcode tools. Yes, it's still majorly buggy and yes, there are still many features missing in action -- but it's such a treat to see how the new tools are evolving into their final form.
Today, Apple has released developer preview 3 of the new Xcode 4 suite, which you can download by heading over to the developer.apple.com site. You will need to sign in with your online or paid developer credentials to access the page and the preview dmg. I'm a little iffy about what the NDA situation is with regards to the release (I believe it is under NDA until it leaves beta) so I'll leave finding out about the details (there's a Readme and release notes) to you.