My Epic Touch 4G can only boot into Odin mode Installed ClockworkMod via ROM Manager, selected reboot into recovery via manager and the phone only boots into "Android System Recovery" now. OK button doesn't work to select "reboot now", though long depress does what it should.

I just flashed the EG30 tar file (see comments) successfully, but it booted back into "Android system recovery" again and the ok button will not select on "reboot system now" but long long depress will reboot it... back into recovery though. Any ideas on how I can get the phone to start up properly?
My first instinct is to say the partitions are messed up.  I would try using the "shipped ROM" from here and re-partitioning via Odin.  I found the .pit file here.