We've been hearing rumors about digital Dreamcast games since forever, but some brand new evidence appears to categorically suggest that both Crazy Taxi and Sonic Adventure are en route to Xbox Live Arcade. This is amidst further "confirmations" of Doom II, Metal Slux XX and Quake Arena.
A member of the Digiex Forums posted a batch of screenshorts purported to be nabbed from a dev kit 360. Just for good measure, he revealed Sonic 4's Super Sonic as well. The screens themselves all look rather genuine, and since the rumors about Sonic Adventure on XBLA have been consistently coming in for several months, it's not hard to believe at all.
I'd say it's a given that Sonic Adventure is coming to XBLA and more Dreamcast games will follow, especially since the last "rumor" pretty much confirmed it. I am looking forward to it as well. There are some classic games out there that never got the spotlight they deserved. A second chance to shift a few more copies is welcome.