I am posting this from my iChat client using a service called IMified.
Imified is an instant messenger buddy that works across all major IM networks and offers access to a growing number of web applications, as well as productivity tools like notes, reminders, and todo's. Imified helps you get things done faster.
Basically IMified gives you access to various web services (Google Calendar, Wordpress, Basecamp, blogger, TypePad, LiveJournal, Remember the milk...) via your IM client. So this post is coming from iChat on my MacBook, but it could also be posted from my phone using my AIM client, or from Yahoo Messenger, MSN Messenger, or Google Talk. At Lewis we have a reader board that displays an RSS ticker of upcoming events. The events are powered by a WordPress.com weblog. I can now update the events ticker just using my IM client.
From reading their support forums, it looks like they are at work on a metaweblog api implementation which means I should be able to add my Drupal sites and post to them too. A pretty nice little tool...