Jabber Journal #15 is out. It covers recent IETF info, PubSub, In-Band Bytestreams, encrypted chat sessions and more. Ejabberd as well as jabberd2 (the rewrite of the original jabberd) are two open source servers worth keeping an eye on.
A few months ago a new version of Smack (a client-side library for Java) was released. I would suggest it to anyone who needs client-side functionality in Java. Jabber.org has tons of resources including jabber libraries, client software, server software, and a list of public servers.