There's a new cat in town: registered Mac OS X developers can now hit Software Update for the just-revised latest update to Lion Developer Preview 2. The prerelease version of Mac OS X 10.7 works with XCode 4.1 Developer Preview 3.
If you're a developer but you haven't yet downloaded your Lion installer (and why not?) you can pick up your redemption code in the Mac Dev Center and then download Lion from the Mac App Store at your leisure.
Apple OS X Yosemite