In case anybody missed it in the drama of yesterday, the official Android 2.2 build has been released to Nexus One owners. Hopefully we will only have a month or two to get an official version, but I'm sure XDA will be cooking up some versions of it for the Evo.
Latest Froyo build for the Nexus One is the official Android 2.2 update | Android Central
Latest Froyo build for the Nexus One is the official Android 2.2 update | Android Central