Internet links on compression and related topics:

http://www.mpeg.org/index.html/

This is not the “official” MPEG site, but it is without doubt the richest source of information on almost anything connected with compression. There is even a site search engine! The site is published by MpegTV LLC, a San Francisco-based privately owned company founded in 1997, and maintained by Tristan Savatier, a long-time contributor to MPEG. Most, if not all, of the following sites may be accessed from the approximately 2000 links indexed in mpeg.org.
http://drogo.cselt.stet.it/mpeg/ This is the official MPEG site. A visit to this site is particularly useful for those interested in the ongoing work of MPEG. There are some excellent tutorials on completed and current work.

http://www.m4if.org/

The industry forum for MPEG-4. News and information, and links to companies with MPEG-4 products.

http://www.mpeg-analyzer.com/

Home of the excellent MPEG Analyzer.  This program is great fun, and really instructive as to what really happens in MPEG encoding.  There is a demo version on the CD, and the latest  version is available for download from this site.

http://www.jpeg.org/

A great deal of information on JPEG, including the continuing work of the committee.

http://www.dvpa.com/links/

Links to many sites covering DV compression.
http://www.real.com/

The home of Real Video and Real Audio; free players and trial versions of authoring programs, many sources of streaming media.

http://www.microsoft.com/windows/windowsmedia/en/default.asp

Everything you ever wanted to know about Windows Media, and all the tools you need to do it. Free (at the time of writing) players, authoring software, and servers.

http://www.vide.gatech.edu/cookbook2.0/

Excellent source of information on video conferencing.

http://www.internz.com/compression-pointers.html

Many links to sites addressing every aspect of compression technology.

http://www.atsc.org/

The home of the Advanced Television Systems Committee and the ATSC Digital Television Standard (A/53). Other documents available from this site include Digital Audio Compression (AC-3) Standard (A/52), and Guide to the Use of the ATSC Digital Television Standard (A/54), an excellent tutorial on compression and digital transmission.

http://www.dvb.org/

The European Digital Video Broadcasting organization maintains extensive information on the DVB standards.

http://www.unik.no/~robert/hifi/dvd/

Extensive information on DVD; what was digital video disk or digital versatile disk is now just DVD!

http://www.davic.org/

The Digital Audio Visual Council was an association of some 200 companies seeking interoperability in the multimedia communications world. The specifications the organization generated are available on this web site.

http://www.smpte.org/

The Society of Motion Picture and Television Engineers is an international standards organization. SMPTE publishes the studio standards that form the input to standardized compression systems, and many standards relating to compression.

http://www.iec.ch/    http://www.iso.ch/   http://www.itu.ch/

Official sites of the standards organizations, including information on the purchase of standards documents.

http://www.dolby.com/

Many general interest and technical papers on audio systems and audio compression.

http://www.technicalpress.com/

Home page for Jerry Whitaker (series advisor for Video Compression etc.), author of books on many TV & communications-related subjects.  Information on industry conferences and useful links.

http://www.sv.philips.com/mpeg/technolgy.html

For most information on MPEG audio, consult the links on mpeg.org; this site contains a good description of the MUSICAM system.