Love the list of tools that are showing up all over re: the use of Twitter!!! My trouble is choosing one or two to get the job done without spending tons of time exploring them all!
Tomorrow (Sun March 29) the Working Artists Network is hosting a Roundtable in Portland OR with a panel of folks who use social media to market their art and creative services - one tool of which is Twitter (of course!). Biznik members Jeff Fisher and Rebecca Shapiro are two of the presenters, and I'm moderating. It promises to be quite a powerful presentation...
You can find information on this event at http://www.workingartistsnetwork.com/?page_id=72
Best, A.

