I too am usually against name changes, but I think it's appropriate at this time. OACS is just not a good acronym, and OpenACS isn't really that great of a name.
I like the word Open.
I would vote for:
Agora (although it's a little obscure, it sounds good)
Communikit (that's kind of perfect actually)
Perhaps we can narrow this down to five candidates and vote? Does anybody think we shouldn't change the name?