For all you folks running the CyaongenMod brand of custom ROM -- and if you're not, you really should give them a shot -- know that CM6.1 has just be released. Released as in stable Android 2.2.1, ready to go, flash at your convenience.
And the list of supported phones is large -- and growing: Nexus One, Droid, Dream/Sapphire, Hero, Desire, Incredible, Espresso (myTouch 3G Slide), Supersonic (Evo 4G), Legend, Vision (G2/DesireZ), Geeksphones ONE, Z71, Wildfire, NVidia Harmony, Ace (Desire HD) and Glacier (myTouch 4G).
For those of you new to the game, CM ROMs are more than custom ROMs, actually. They're built off the publicly available Android code -- that's the Android Open Source Project (AOSP) -- and include a ton of cool tweaks from developers throughout the community. You'll want to check out the CM6.1 changelog for all the goodies, and get to downloading. [CyanogenMod, CM6.1 changelog]