Web 2.0 has alraedy been stacked with new ideas, and here is another one. This one is called Sabifoo and it allows you to send instant messages to RSS. This brings to light a whole new publishing infrastructure, where publishing is as simple as sending a message. Sabifoo uses the instant messaging account you already have. You just need to add Sabifoo as a buddy on your friends list and start publishing to your RSS Feed.
The people at Mashable have other interesting ideas.
I think there’s a lot more potential here - I’d love to see a private notetaking application built in the same way. After all - your IM client is always on your desktop, and could provide an easy way to jot down an idea. But you could do more than that - how about the ability to use your IM client as a submit form, and send those notes off to other services via an API? You could create calendar entries (”meeting at 2pm Tuesday”), draft blog posts, write SMS messages and add items to your todo list, all without firing up your browser. Mash it up with Backpack, Writely, 30Boxes, Wordpress and whatever else takes your fancy.
Other than that, I think it'd a great tool for blogging if blogger is blocked at your office.