There are two newsgroups that have compression in their names:
comp.compression
alt.comp.compression
You might also try slightly unrelated groups that deal with math or
specialized algorithms:
sci.crypt
comp.algorithms
sci.math
If you're using a newsreader, you just enter compression into a specific
servers newsgroup list to locate groups with words in their name.
If you're using Google Groups, you just enter "compression" into the "Search
for a Group" search box on GG's homepage.
http://groups.google.com
Rod Pemberton