Wow! I had no idea that site existed... looks like it hasn't been updated in awhile (?).
But thanks much for finding it!
As for info sites, let's see...
For starters, in case you don't know (and apologies if you do), go to the 2000AD site (http://www.2000adonline.com) and check out the left side-bar. Under 'Characters' there's a bit called 'The Dredd Zone'. It has a good map, a timeline and all sorts of aother useful data.
More info can be found through the links section: http://www.2000adonline.com/?zone=fan
And here: http://www.2000adonline.com/?zone=&page=links
There's Class of '79, too: http://www.2000ad.nu/classof79/website.htm
Of course, you may know all of this, and if that's the case, again I'm sorry... hehe.
Hope that helps!
And if you find any more, let us know...