CF is definitely "in" - looks much sexier, and can be made fairly cheaply.

Ti, on the other hand, is more expensive and looks more "old-school." Most large manufacturers want to keep that 'fresh look' that curvy carbon fiber has to woo customers.

Strangely, around here in NorCal, most of the serious cyclists I know would love to have a Ti bike, if not own one already. It's not like they're forgotten - they're just considered very high-end gear.