VLC media player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg, ...) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.
Security update: Fixed buffer overflow in Real demuxer (SA-0811, CVE-2008-5276)
Bunch of small bugfixes
Windows, Mac, Windows
Product page: here