Hiya
I use my newsgroups that are from the ISP, but they only seem to keep the recent ones, ie 1-2 days old. You can also get the binaries as well.
However, you can get some free ones that have binaries:
http://freenews.maxbaud.net/
Right at the bottom is a search box. Make sure the first box, Free Servers is ticked, and then type in what you want. If you don't know the full name of the group, type in a word. For example, mp3. Then, it will list all the groups with mp3 in the name, eg:
alt.binaries.sounds.mp3
alt.binaries.sounds.mp3.new-age
alt.binaries.sounds.mp3.classical
etc
They list the servers, and how many articles, or posts. Just click on the server of group, and your newsreader will kick in.
Regards
eddie