Vote Raven! And not just because I came home from work this morning to find a burning effigy of the Brushie Bat in my front yard, with a note scrawled in the blood of the Elder Gods reading 'know your place' underneath it.
They also work across games. As in I could be playing Champions and you could be playing Star Trek and we could still play last poster wins.
Wow, that's actually impressive. If I were the developer I don't think it'd ever have crossed my mind to link up custom chat in separate games. I bet it was a suggestion box thing that made it at Cryptic, but maybe not. :p