http://psi.affinix.com – good (not only mac) jabber client
I’ve found your blog entry with PubSub (http://pubsub.com). It’s rather new and promising technology witch in short time will by widely used in jabber.
Did you know that you can use jabber to bloging? Just sending a messages to jogger (jabber powered weblog) create new entries and when someone make comment you can get IM message about it. You can see mine at http://arael.jogger.pl . It’s in polish but .. they are many english jogger in the web – you just have to google.
Best regards,