On page 2 of an article about Microsoft's diminishing influence:

What's left? Microsoft Messenger, but most Mac users eschew it in favor of iChat, which supports both AOL's instant messenger and GoogleTalk, or AdiumX, which supports more or less every instant-messaging scheme under the sun, including Microsoft's. …

OK, it's in passing, but it's still cool. ☺

Thanks to Dan Weeks for the heads-up!