Well there's good stuff but it seems like a lot of it is "serial" television, meaning you might get lost if you just jump in. Sons of Anarchy on FX is a biker gang drama that's pretty good (it tends to push the envelope a bit in the way that The Shield did, back when that show was in its prime) but it's in its second season. I'm watching Fringe on Fox because weird sci-fi is a plus for me (it's sort of X-Filesy)
Mad Men is up on AMC and it's probably the best show on television right now writing-wise, or at least that's the consensus. I don't know when Breaking Bad comes back but it's some brutal shit that also garners a lot of accolades.
In lighter fare, I guess House might be better this season (IMO the last few seasons have been well boring) and Lie to Me is being run by Shawn Ryan now, and he created The Shield, so that might distinguish itself at some point.
As far as new shows go, I don't know, there's Glee but it's divisive. The gays love it and so do all people of discerning taste. Flash Forward looks promising. On ESPN they're celebrating their 30th anniversary by running a series of 30 hourlong documentaries (30 for 30), some from distinguished directors, about lesser-known events in sporting history. The first one was about Wayne Gretzky's move from the Edmonton Oilers to the Los Angeles Kings, and from what I understand it's really excellent.