Google has been slowly launching all the regular Yahoo features one after another. First it was free email, followed by photos, groups, news, froogle, IM, voice chat etc etc. I use both Yahoo groups as well as Google groups and I must say that Yahoogroups is far superior. If you are thinking o starting a new group I would highly recommend Yahoo. There are many so called social networking sites that could do the job, but Yahoo has the inherent advantage of having been around longer than most. The other day someone sent me a few photos while I was in Yahoo Messenger. I was pleasantly surprised that I could select the pics that I wanted and save them directly to Yahoo photos. Cool bit of integration.
The database feature in Yahoogroups lets you maintain a phone book online of all your members. It supprts photos, files, calendar, and polls as well. In comparison Google groups has hardly changed visibly since its launch. Google seems to launch a whole bunch of competing products but doesn’t seem to be doing justice to most of them.