too many to name....or even remember...
CBS is sometimes a victim of their own success. They often cancel series a year or two early (arguably Cold Case, Ghost Whisperer, Medium and Numb3rs) when they still have a loyal following and decent ratings. Heck, just move 'em into a Friday or Sunday timeslot. CBS also has a habit of cancelling series after the first season if it's not drawing 12 million viewers. Just look at The Defenders. The show went head-to-head with two other new legal shows, Law & Order: LA and The Whole Truth, and ran both shows out-of-business while pulling in 10 million viewers weekly. Still, CBS decided to pull the plug on them. Likewise, as much as I didn't like Criminal Minds: Suspect Behavior the network cancelled them after their first season...and they were regularly drawing 10-12 million viewers. Heck, the show wasn't that bad - it just needed some character and writing tweaking.
Anyway, now I'm upset about Numb3rs and I get the feeling Ted Danson is going to kill CSI.