As you know you can see everyone who's registered for the conference, but I highlight 4-6 participants every day as this may be an easier way for you to digest the list. You can also look at the Program so see who is doing what.
Kevin Emamy develops and runs CiteULike. You can read my interview with Kevin from a few months ago. At the conference, he will participate in the Online Reference Managers session.
Rhitu Chatterjee is the Multimedia Science Journalist and Podcast Host at The BBC/WGBH/PRI's World Science. She is on Twitter and at the Conference she will do a demo of World Science.
Sam Krishna is the Chief Problem Solving Officer at The Analytical Group and he tweets.
Rebecca Weinberg is working on her PhD in Biochemistry and Molecular Biology at Penn State University.
Andrew Thaler is a graduate student at the Duke Marine Lab, a blogger and twitterer.
Gloria Lloyd is a freelance copywriter/editor, marketing writer, and journalist. And she is on Twitter.