It's not just me -
According to a story on eWeek, AOL has mistakenly suspended a very large number of AOL Instant Messenger (one of the most widely used IM programs) accounts, by mistake. I don't know about you guys, but this happened to me and a large percentage of friends and coworkers. AOL says that a fix should be ready by Monday.
AIM also finally added the following bit to their tech support page halfway through the day today: "If you recently began receiving an error message indicating that your sign on has been blocked because your account has been suspended, please be patient as we restore the accounts over the next several days. We apologize for the inconvenience." Rumor has it they'll have all accounts restored by Monday.