This weekend Android 2.2 (Froyo) leaked for both the Sprint Epic 4G and the Samsung VIbrant. Among some drama regarding it's status for release it was only leaked to a small group of people.
When Froyo leaked for the Epic 4G to it's select group of people it was very unstable. Comments included it being far from ready for release- even to other hackers. The build has problems with the phone's radio and it's not stable at all. "Releasing it would be a big mistake"
2.2 for the Samsung Vibrant was also leaked to a select few. Being generally more stable than the Epic 4G's two custom ROM's have already came out of the build. You can find those here, and here. The original leak has not yet been made available but the 2 ROMs shall do, for now.
[Via Android Central]