OT: Couple of google groups questions

Now that those of us in the UK are forced to use the new google groups interface to their archive... 1) How do I see how active a group is or what groups exist in a particular hierarchy? (e.g. I used to be able to stick "comp.sys.sun" into the search field and it'd show me both that hierarchy and group activity, which was handy when deciding where to post) 2) Are full email addresses available to view by registered users? It used to handy being able to try and contact someone from x years ago who had knowledge of something I wanted details on. Now Google seem to be masking them all though... I'll send these two to Google themselves of course, but as you US guys have been stuck with the new interface for months maybe you already have answers... 3) Is anyone else archiving usenet or do Google have sole control? cheers Jules