Chances are it's still alive. I've done a lot of flashing to my router, including flashing total garbage into it and haven't killed it yet.
Try to dig up the thread that talks about using tftp to upload just the kernel portion of the .trx file. Follow the recovery directions in that thread. This might also be helpful:
http://wl700g.homelinux.net/drupal/?q=comment/reply/54
- K.C.