Who's suing whom in the telecom world? Feast your eyes on this infographic
The infographic also includes snippets of each law suit, which is handy for understanding the overall picture. Some of the lawsuits are hilarious -- check out Kodak suing Samsung for "image storage & movie previews" -- aren't patents awesome?
Incidentally, I think I just stumbled across a new game: go to Google and start typing "apple suing"... and see what suggestions pop up! It works well for "microsoft suing" too.