My current list:
Avengers/Invaders (Marvel)
Astonishing X-Men (Marvel)
Booster Gold (DC)
Captain America (Marvel)
Captain Britain and MI13 (Marvel)
Criminal (Marvel/Icon)
Daredevil (Marvel)
Fantastic Four (Marvel)
Green Lantern (DC)
Guardians of the Galaxy (Marvel)
The Incredible Hercules (Marvel)
Manhunter (DC)
Northlanders (DC/Vertigo)
Secret Invasion (Marvel)
Secret Invasion: Inhumans (Marvel)
Secret Six (DC)
She-Hulk (Marvel)
Terra (DC)
Thor (Marvel)
Uncanny X-Men (Marvel)
Wonder Woman (DC)
X-Men: Worlds Apart (Marvel)
Manhunter and She-Hulk are cancelled soon (tough luck, ladies), and all the minis apart from Avengers/Invaders will be wrapped up within a few months. I decided to drop Northlanders, but my store left it on my list so I read the first issue of the new arc and liked it well enough (plus, completist).
In terms of upcoming stuff, Incognito will slide into Criminal's place for the upcoming months; no decisions on most of the post-SI stuff until I actually see it, but I'm definitely starting on Agents of Atlas (though I'm not nearly so high on them as a lot of people are), and Slott's Mighty Avengers promises to have Cassie, Vision, and Hercules in the first few issues at least, so he's got at least those from me. So little of what DC's doing lately draws much reaction from me.