The "3 shows" thread made me a little nostalgic for past shows and thought it would be an interesting topic. I know many shows are now in syndication but it's not the same as getting new seasons every year.
The Unit - I loved that show and even the S.O. enjoyed it.
Chaos - If you blinked you missed it on Friday's. I think 3 episodes were aired before it was recently yanked. It was oddly funny in a "Body of Lies" kind of way. It was disappointing to hear it was cancelled so soon.
E.R. - Even in the later days it didn't seem to be slowing down. We were addicted to that show.