Any additional info? Was it just a ROM you were trying to flash or was it a radio or recovery or something? I've never seen a rom flash attempt go that bad. I recall, a few posts back, someone else flashing a ROM for an EVO 4G or something on his and he' was ok after a little work. If you can't get to recovery, hboot, or get adb to see your phone correctly i'm not 100% sure. You may be able to push a RUU to it via adb despite it showing up with a weird name. Or you may be able to flash a recoery to it via adb then install your desired .zip from there after wiping all data.
Keep us posted.