Spammers target IM accounts
Growing incidents of spam attacks on some instant messaging networks are raising vexing questions about the future of one of the fastest-growing applications on the Internet. [Privacy Digest]
Benefit of leaving CBP behind, I get to route things correctly now. Not sure I like what it does in my template, though.
Jabber has some bandwidth limiting features that server runners can invoke, which can somewhat limit the problem. You still can't prevent DDOS, but it at least raises the bar.