If you're on a Mac, just use terminal and SSH into the ATV2.
On another note, I've started to use Plex with my ATV2 instead of XBMC. I find the interface much nicer, not as laggy, and easier to work with. It does have its drawbacks, though. I can't browse a directory the way I can in XBMC, but I've read that so many people are upset that this feature was removed that tehy will be putting it back in again in the next release.
Either way, not having to convert all my videos to MP4 to satisfy ITunes is definitely the way to go.