Few thoughts
Veronica Mars (up to half-way through the third season before the network started sticking their oar in)
Big Bang Theory
How I met your mother
Battlestar Galactica (thought I suspect you've already done this)
Smallville (after the season one freak-of-the-week, and up to about season 6)
Warehouse 13 (newish series in the US, not seen it yet, but sounds good)
( Fireflier La la la la, not listening on, Wed 9 Sep 2009, 11:52, 1 reply, 16 years ago)

Also (just checked some other stuff)
Glee - watched the pilot and it's fun in a cheesy way (series starts this week)
Castle - Nathan Fillion from Firefly in a "Murder he wrote" kinda thing, but quite fun.
Dollhouse - stick with it til at least episode 6 and make sure you see the unaired episode - Epitath 1
30 Rock - refreshingly surreal for a US show in places

...and there's a remake of V showing from November, which might be interesting.
( Fireflier La la la la, not listening on, Wed 9 Sep 2009, 11:57, Reply)