As usual, I've been following the Nielsen ratings for the major networks. Fringe was just officially renewed for next year--it did much better on Thursday than Past Life did in the same slot, which I think pushed it over the top. The first category below consists of series that have officially been picked up for next season. The next group is not yet official, but I can't imagine House, Desperate Housewives, and the like NOT returning. Then there's a doubtful group (with varying prospects), and last of all, the handful of shows I would be pretty surprised to see still on the air next fall, though they're not impossible. No reality shows listed, but the ones I care about (American Idol, Amazing Race, Survivor) are all safe.
Officially renewed: 90210, American Dad, The Big Bang Theory, Bones, Brothers & Sisters (renewal reported by Hollywood Reporter on March 6), The Cleveland Show, Community, Cougar Town, Family Guy, Fringe, Glee, The Good Wife, Gossip Girl, How I Met Your Mother, The Middle, Modern Family, NCIS: Los Angeles, The Office, Parks & Recreation, The Simpsons, Smallville, Supernatural, Two and a Half Men, Vampire Diaries
Shoo-ins: Criminal Minds, CSI, CSI: Miami, CSI: New York, Desperate Housewives, Grey's Anatomy, House, Law & Order: SVU, The Mentalist, NCIS, Private Practice
Some doubt: 24, Accidentally on Purpose, Castle, Chuck, FlashForward, Gary Unmarried, Ghost Whisperer, Heroes, Human Target, Law & Order, Lie to Me, Life Unexpected, Medium, Mercy, New Adventures of Old Christine, One Tree Hill, V
(Several of these shows will be cancelled. I just don't know which ones exactly. There is no way they all survive. At this point, I think Castle, Chuck, Ghost Whisperer, L&O, Medium are probably all safe. FlashForward and V will really depend on the ratings when they return from hiatus. There's been talk of a 24 movie rather than another season on TV, so... that one could go either way. I almost put Mercy in the "probably dead" category.)
Probably dead: Better Off Ted, Brothers, Cold Case, The Forgotten, Melrose Place, Numbers, Scrubs, Til Death, Trauma
ETA: Already cancelled or ending this year -- The Beautiful Life, The Deep End, Dollhouse, Eastwick, Hank, Lost, Past Life, Three Rivers, and (one of my favorites) Ugly Betty