Classic Dragon, Polyhedron, Ares Magazines (Others) Available for Free Download
Now, I have no idea about the legality of the uploaded works at the following link, but I do know about the quality of the articles in these out of print - alright, defunct - periodicals. Overall, extremely high quality. Get them here. (I assume the legality is a "gray" area on many of these titles)
Hey, look, Omni Magazine is there too. As is Cracked! Awesome!