Thanks for this thread, just got my Hero today and im freaking loving it!!
Was a little disappointed with the few bugs but thanks to this forum its all fixed.. wasnt that big of a deal anyways since im a techie guy.
I figured I would post this link I found after some searching, I didnt see anything here about setting my own cut up mp3's as ringtones from my memory card.. the below link shows how to setup the folders so the ringtones are seen in the sound settings.
http://community.sprint.com/baw/message/122196#122196
Hope it helps out someone!