Well let's see.
Of series currently being in production I'm really attached only to Castle, and since I hate annoying week long waiting for another episode, I'm waiting patiently for the season to be finished to watch it in one huge Castle-fest (or, realistically, a month of 6 series per week). Luckily, the season's end will be at May, the month ridden with extra-holidays where I live
Liked The Big Bang Theory, but even though it seems to be all around ok: funny, nerdy, and all, I found myself having absolutely no regrets that I haven't watched last season yet. May be I'll catch up on vacation.
All other series that I like are the ones of the past: recently I re-watched Jeeves & Wooster - excellent series that I would recommend for anyone enjoying refined, elegant English humour. If you've read the books of Woodehouse and didn't like these, try the series anyway, it's so much better than the original books due to fantastic acting of young Stephen Fry and Hugh Laurie! May be not "young" young, but definitely younger than in "Kingdom" and "Dr. House", respectively
Actually, when watching Dr.House for the first time, it was very hard to shrug off nagging thought of "hey, so that's what happened to Wooster after he grown up!"
Watched first season of LEXX - not bad, but it's somewhat simplistic as it is and I've read on wiki that it will be the more "stupider" with each following season, so I'm not sure whether I should spoil my good impression from first season by watching on.
Tried to watch Northern Exposure, but apparently failed by season 5 or so: while originally very appealing thanks, among other, to its somewhat Icewind Dale'ish setting, the show eventually disappointed me as it got the tendency of being not about main character, or two, or even six, but rather about a whole village of people, losing it's focus on supposedly main characters and leaving not much place for their personality or, at least, story development.
My short term plan includes re-watching Moonlight and Due South as well: Moonlight had the best, almost authentic VtM:Bloodline feeling of all vampire series around, so much better than stupid True Blood, and Due South - well, I just love it for no apparent reason, other than good actors, good stories, great music and of course Diefenbaker, white wolfdog