MPEG Pointers and Resources - http://www.mpeg.org/
Annotated links of MPEG resources, focused mostly on the MPEG-1 and MPEG-2 standards.

Moving Picture Experts Group (MPEG) - http://www.chiariglione.org/mpeg/
News and documents from the ISO/IEC working group that develops standards for encoded audio and video.

MPEG Industry Forum - http://www.mpegif.org/
Formerly known as M4IF, it now provides news and resources related to the MPEG-4, MPEG-7 and MPEG-21 standards to help with their adoption and use.

DivX.com - http://www.divx.com/
Codec news and downloads, information and movie trailers.

DivXNetworks - http://www.divxnetworks.com
Creator of the technology. Offers solutions for video-on-demand, software and services for corporate customers.

DivX Movies - http://www.divxmovies.com/
Download the codec, trailers, software, news and information.

Free Avi/DivX - http://avicodec.duby.info
Helps you find and download codecs, needed to play a multimedia file.

Free Codecs - http://www.free-codecs.com/
A resource site providing codec news, divx-related tools and forum.

Open Subtitles Database - http://www.opensubtitles.org
Open multilanguage subtitle database, advanced search, no registration, RSS, XML.

FFDSHOW - http://sourceforge.net/projects/ffdshow/
Open source DirectShow decoding filter for DivX, XviD, WMV, MPEG-1 and MPEG-2, based on libavcodec from the FFmpeg project.