Here's a page for reviews of printed comics.
I'm not a comic buff, so I don't have very much to say here, but I do have two recommendations - 2000 AD, and its evil cousin, the Judge Dredd Megazine. Both are frequently available at not-too-terrible prices from your local friendly PaperWeight (sadly not actually by weight).
UnderstandingComics (Scott McCloud)
ReinventingComics (Scott McCloud)
ComicsandSequentialArt? (Will Eisner)
WatchMen? (Alan Moore)