Oh, there definitely *was* and unrevoked app...back on Android 2.1
. It stopped working with the upgrade to 2.2, and they didn't bother to maintain it. They moved on to unrevoked-forever, and the full root method. If you come across any old threads talking about how unrevoked won't allow you to flash ROMs, blah, blah, blah, it's because unrevoked used to be a temp root solution via an app. It obviously no longer is, nor will that app work anymore. As was stated, z4root will work, though, just like the old unrevoked app used to, but with 2.2.