Over at Ace's Hardware message boards, (also picked up by The Inquirer) folks are commenting about UA string sniffing that blocks other-than-IE browsers from WMP9. Nothing that's really news to long-time Mozilla (or Opera) users, but there are some positive and some cute comments in that tread.
update: links fixed. thanks alan and david. It was late at night and I got the names and links all wrong but it's fixed up now.