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.
Dorothea Salo is an academic librarian in Wisconsin who blogs on The Book of Trogool. She tweets as well. At the conference, Dorothea will co-moderate the session "Scientists! What can your librarian do for you?" and teach a workshop "Repositories for Fun and Profit".
Peter Lipson is a physician in Michigan. He blogs on White Coat Underground and Science-Based Medicine and tweets. At the conference, Peter will co-moderate the session "Privacy, ethics, and disasters: how being online as a doctor changes everything" and teach a workshop ""Podcasting 101".
Anne Jeffersonis an assistant professor of geology at the University of North Carolina at Charlotte - she blogs on Highly Allochthonous. At the conference, Anne will co-moderate the session "Casting a wider net: Promoting gender and ethnic diversity in STEM".
Suzanne Franks, engineer and femininst better known online as Zuska, is another veteran of these conferences. Her blog is Thus Spake Zuska.