AIM users take note: do not under any circumstances accept or install a "humorous Osama bin Laden game" if offered to you:

Some users of the popular AOL Instant Messenger program were bombarded Wednesday with messages seemingly from friends that linked to a humorous Osama bin Laden game.

Downloading the game, however, installed a piggybacking program that broadcast the advertisement from the infected computer to all correspondents on its AIM buddy lists.

No word on MSN Messenger, so that seems safe enough. For now.