We have been considering some local clubs/groups that sound interesting:
One for boys from 7-11 who have Aspergers, one for secondary age boys who have Aspergers and one for siblings of children who have Aspergers (there are equivalent girls groups as well).
From what I can make out, they are a bit like youth clubs, with table tennis etc, but with 'a focus on improving social skills and building selsf-esteem, by engendering a sense of belonging'.
They run one evening a week.
Ds is quite keen to find out more and try it out if possible and ds2 quite likes the idea of the siblings group, although the leaflet (sent to us by CAMHS a few months back) dates from 2009 and there's no website, so we don't actually know if it still exists.
Does anyone have any experience of this type of group and if so, was/is it a postive experience for their ds?
I 'get' the importance of a sense of belonging etc, but am not sure how much social skills can be improved when the room is full of others who have the same impairments. 
At the moment I'm thinking it would be good for ds, if only from an extra activity/interest point of view and for him to finally get to meet other children with AS, as I do feel he is starting to recognise his differences from his peers at school and it would be good for him to realise that he's not alone.