Here's more about Spacehack:
Behind Spacehack: GeekDad Talks to Ariel Waldman - Wired GeekDad: Spacehack is the brainchild of Ariel Waldman, recently named one of the most influential individuals in Silicon Valley. Waldman was previously a program coordinator at NASA CoLab, which connects communities inside and outside NASA to collaborate.
GD: Have you participated in any of these projects yourself?
AW: I've supported the NASA Regolith Excavation Challenge (part of the NASA Centennial Challenges progam) but I have not yet been a participant. I plan to participate in the Stardust@Home cause soon.
Ariel has some other projects:
Pownce, a social P2P sharing application
CupcakeCamp - an ad-hoc gathering born from the desire for people to share and eat cupcakes in an open environment.
Shake Well Before Use - coverage of the intersection of art, advertising, sex and technology