Do you know that currently Google supply both RSS and Atom feeds for every news-group. To view a group's feed information, go to the group's homepage and click the "About this group" link under the group’s title. Under "Feeds," you can select "Latest 100 messages (RSS)" or click "View all available feeds (RSS and Atom)" to see all of your feed options. Most feed readers will accept both RSS and Atom feeds.

To get a feed from specified group use this format:

http://groups-beta.google.com/group/NAME-OF-GROUP/feeds

for example to get feeds from comp.lang.ruby group: http://groups.google.com/group/comp.lang.ruby/feeds