I subscribe to and run a few magic Yahoo Groups which I find far better than web based forums or usenet groups like UK-DIY.
Let me qualify that by saying that the content and the crack around here is first class, but its unmoderated.
I don't use groups where I have to visit a site to see whats going on & then search through categories. The Screwfix forums are like this & I just can't be arsed. PITA.
I like things delivered to my inbox like UK-DIY. The problem with groups like this are that they are open to spammers & wankers who only wish to attack others.
I don't mind a good row, but there are some twisted, sad people out there.
The Yahoo Groups I run are by & large used for sensible discussions. Any OTT flame wars I can stop easily by moderating the posts or banning the members - although I've only had to do that once in 8+ years.
The UK Magic usenet group was simply destroyed by one particular idiot who just attacked every post raised. He wanted to join one of my Yahoo Groups & I refused access. He eventually joined under another name, but as soon as he started his crap I removed him.
I'd much prefer UK-DIY as a Yahoo Group personally, as long as it had a strong but fair moderator running it.
Just my 2p's worth.