Well I got an Evo to play with and found this recently
http://www.youtube.com/watch?v=J7-SqsK3vlc
Anyways, I bought a cheap mini bluetooth keyboard and it seemed to work. I managed to tape the keyboard into an old spare phone case that flips open so now when I want a keyboard with EVO I just take out the keyboard and prop the evo on it's kickstand
I know this isn't the best way for people that want to have a real keyboard with phone but the depth of the evo+keyboard is about same as a phone with a keyboard so it doesn't feel too bad in pocket when I carry it. And I have more problems carrying the evo in pocket than I do the keyboard. So maybe someone would just tape the keyboard to the evo case and be done with it.