There's two ways you could look at this, depending on how cynical and jaded you are. You could jump up and down knowing that Alien Hominid, one of the most successful and interesting indie games ever made, is coming to Microsoft's popular Xbox Live Arcade service this winter ... or you could grind your teeth knowing that your perfectly suitable Xbox copy isn't backwards compatible (yet?) so, if you want that side scrolling action, you'll be shelling out for the same game again. Granted, it was only $20 to begin with, and a $10 XBLA price would still keep the total well below your average AAA title, but it's the principle dammit!
This is a slippery slope for Microsoft to be on. Cynical (and/or cheap) gamers have foretold the day when Microsoft would use future profits to determine the fate of backwards compatibility on a particular title. Conspiracy theorists will point to Alien Hominid's relatively spartan and humble graphics as proof positive that Redmond isn't playing fair. Of course, these accusations will be premature since there are certain to be more backcompat updates before the Fall console launches, but they'll be made regardless.
Game Informer reports that Alien Hominid developer The Behemoth is also bringing their in development title Castle Crashers to XBLA in early 2007. For more indie-dev goodies, check out the excellent Gamasutra podcast this week for an interview with The Behemoth's John Baez.
[Update 1: 1UP previewed the game at the Comic-Con expo that began today. They confirm the obligatory 360 upgrades like high-def and widescreen support, but also note that "the developers are looking into adding a few bonuses here and there to give the Live Arcade version something extra for players who are familiar with the original" but add "we don't have any details on that front at this point."]