The Google Groups team launched a new beta version, available to anyone at groups-beta.google.com. Some of the new features available in this new release :
Page Creation: Create and collaborate on shared web pages, hosted within the group itself.
Customization: Select pictures, colors and styles to give your group its own distinct look.
File sharing: Upload and share your work with others in your group.
Member profiles: Learn more about the other members in your group.
http://googling.phpmagazine.net/upload/2006/10/new-groups-thumb.jpg
I loved this new version so much, I find it even faster. The user interface is great, especially the link on top to my groups and recently visited groups. There is more activity indicators in the website, views for your message and profile, also stats related to every group : members, activity, category … with a detailed page for the group. A great new experience that you may give it a try.