Half Life makes it to the Dreamcast. However the online capabilities are kicked out. Hopefully the single player mode and the Dreamcast exclusive Blue Shift modes can make up for it. From what I've heard, they can. Half Life as many know is a first person shooter. And it's above many of the other Shooters. The Dreamcast version looks amazing. (As many Dreamcast games seem to do). Look for it in November.
For more info try: IGNDC Half Life Preview.