Use of Seesmic and/or Twitter in Education and Business?

If you have used Twitter (http://twitter.com/wgraziadei) then you know about text-based micro-blogging. Take a look at Seesmic, if you haven't already done so, and try micro-blogging with video You can follow me at http://ww.seesmic.com/wgraziadei as wgraziadei. There is a Twhirl client that links both togther on your desktop. See http://www.twhirl.org/project/twhirl. From my perspective, these seem ideally suited for the mobile learning environment, especially with an interrogatory problem solving didactic approach.

I'm really sold on micro-blogging especially for mobile learning . It's the way to go - short bits and pieces. You pose a question around some information and get learners to answer. Something that would take end-users only 3-5 min to accomplish. Servers let the client know there's new content and pass it along. It's quick, easy and best of all, from my experience, learners learn best with the small bits and pieces of Q&A information.

Does micro-blogging have a place in education and business? If so, WHEN, WHERE, WHY and HOW do you use or would you use either or both? Are these two approaches (text- and video-based) complementary companions? When do you use one and/or the other? What problems have you encountered using either?