Selling Comic Books

I've got two file boxes full of comic books, many (but not most) bagged. I've been carting these things around the past 15 years, and haven't opened the boxes in nearly a decade. Thinking this is silly, we began considering selling the darned things. I have a large number of 10-14 year old Punisher, Batman, and Manhunter. I also have some other books that I'm not getting rid of, like the Akira books (1-29 only for some reason).

Then comes the hard part: finding out how much they're worth. There is no comprehensive online resource we've found for this. You'd think comic books and computers would be made for each other - both the province of geeks. Oh, well. Anyone want a couple copies of "Death in the Family" original 4-book print run? How about "Black Orchid" - what Neil Gaiman did before Sandman?