So what is the best alternative to Wave at the moment?
Apache and Walkaround seem to be in development and are not really providing hosting to their services.
As for your previous suggestions SocialWork has died (RIP) and there doesn’t seem to be much activity on Shareflow from looking at the forums.
I’m sure we could do with a decent way of organising social events that Wave and the others offered. I’d like to be able to do this with friends, though at 40+, I think most would still prefer email! :-)