If you planned on rooting your Evo to install Android 2.2, know that Sprint is sending out an OTA update to fix a storage bug that will also block root access to the phone (at least until another method is discovered). Having said that, installing 2.2 on the Evo seems like a real pain at the moment anyway. [Neowin Thanks Tzvi!]
https://gizmodo.com/put-android-2-2-froyo-on-your-sprint-htc-evo-with-root-5554698
