New exploit code spreading automatically to MySpace.com profiles has been reported in the wild. It is reported that the case uses QuickTime .mov video:

http://www.neowin.net/index.php?act=view&id=36299

Link to Neowin Forum thread including sample code and screenshot is here:
http://www.neowin.net/forum/index.php?showtopic=517166

Not only bad news. Some anti-virus vendors have protection available:
http://www.f-secure.com/weblog/archives/archive-122006.html#00001038

http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=JS%5FQSPACE%2EA