The Space Access Society site has displayed a list of early confirmed speakers for the Space Access '08 conference. More additions are expected later. Here's the list so far:
Confirmed SA'08 presentations so far: Armadillo Aerospace, FAA AST, Flometrics, Frontier Astronautics, Masten Space, Jim Muncy/PoliSpace, Misuzu Onuki, Rocketplane LLC, Space Propellant Depots Panel with Jon Goff, Dallas Bienhoff, Frank Zegler, and Rand Simberg, Space Studies Institute, SpeedUp, Henry Spencer, Unreasonable Rocket, XCOR Aerospace. Keep an eye on this space for more as the conference approaches.
Many of these presenters were in (as competitors or suppliers) the 2007 Lunar Lander Challenge competition. I'm not sure in all cases who will go for it in 2008, but this year's competition will probably be well-represented at Space Access '08.