Well, one year later, and this game (along with many other Telltale and LucasArts titles) is on Mac. I got it as part of the latest MacHeist mini bundle, but I'd still prefer to play it on my 360 so I can display it on my HDTV and have the added enticement of achievements.
There were rumblings last year that ToMI would eventually come to XBLA (and, it is reasonable to assume, PSN), but nothing yet. I'm hoping maybe they'll do a sort of monkey mania thing and release it alongside the special edition of Monkey Island 2 when that comes out later this summer.