Heroes
Lost - when it returns.
ER
House
Grey's Anatomy
24 - when it returns.
Desperate Housewives
Chuck - I love Chuck, but mostly I love John Casey (Adam Baldwin) because of his role in Firefly.
Fringe - one of the best new shows, in my opinion.
Dexter - I bought the boxed second season so I'll watch that insead of the scheduled time when/if it starts up here again.
Life
Caruso
NCIS
CSI
Lipstick Jungle
Dirty Sexy Money
Terminator
Eureka
Smallville
Supernatural - this is my favourite.
Torchwood

I watch way too much TV. There are probably some that I missed up there as well. Most of these get recorded though so I can watch them when it's convenient for me.