I don't think there's much active development going on on this phone. No dedicated XDA section and with the posibility of ICS, I'm sure there are few people interested in ROMing GB for this hardware. This is pure speculation of course.
There are cm7 nightly builds if anyone's interested. Only problem is they are meant for the lg e730 (aka Lg optimus sol), which is the virgin mobile equivalent of the mytouch, and the sound doesn't work. Only rom out there for now anyways. Hopefully they will fix this problem.