Apologies for the delay...no home PC (just a pile of bits) and I can't access groups from work 'cos of our web filter...but I'm here now
   
 Now then, these groups....I've had a look at all the one's Sheepie's found (Many thanks to Sheepie - you've been very busy 
). Here's my thoughts from first impressions....   
 Windows Live - Looks OK, but maybe a bit limited (Kinda sums up Microsoft doesn't it?)
  
 Yuku - Oh dear, I didn't like it...maybe just me but I wasn't keen - found it tricky to get around the site.
  
 Ning - I liked it!...My second favourite at the moment.
  
 Aimoo - The best of the bunch in my opinion.
  
 I've only browsed through these sites, so I don't know in-depth of course, but I think it's either Aimoo or Ning at the moment.....
  
 Very many thanks to the testers so far! Especially that hard working sheep dog