Media Player Classic!

http://sourceforge.net/project/shownotes.php?release_id=196342

XP / 2k version:
http://prdownloads.sourceforge.net/guliverkli/mpc2kxp6468.zip?download

Me / 98 version:
http://prdownloads.sourceforge.net/guliverkli/mpc98me6468.zip?download

and for our OSX fans.. Mplayer....

MPlayer OS X is project based on MPlayer (The Movie Player for Linux) port to Mac OS X platform

http://sourceforge.net/project/showfiles.php?group_id=62947&release_id=193728

download for OSX:
http://prdownloads.sourceforge.net/mplayerosx/MPlayerOSX2b6.dmg?download