XviD is a codec just like DivX. Most new movies and videos are being encoded with XviD.
Right now 2 new codec versions have been released:
Koepi's XviD Codec Build 19062003-1 uManiac's XviD Codec Build 23.06.2003.1740 Click on Read More... to see what's new and download links.

Koepi's XviD Codec:
Download Link Latest development (unstable) binary: XviD-19062003-1.exe (389kb) What's New:
CVS update. sysKin's new i/p/b-decision. New thresholds: -40 disables bframes, +90 produces only bframes ;) sysKin's new VHQ fixes HomePage uManiac's XviD codec:
Download Link Latest Unstable Build 23.6.2003 17:40 What's New Home Page