ApolloIM is a libpurple based IM client which brings AIM, MSN, .Mac, and ICQ to the iPhone.
Changes:
.Mac support is easier to use. DELETE your .Mac accounts and add them again!
Mysterious double size buddies fixes.
MSN login problems fixed to the best of our testing.
Conversation with hidden buddies and buddies not on buddy list.
Login time improvements.
Fixed a handful of crashes.