Quick list of a few pro-space entities

(not copyrighted; some links may be out-of-date)

Pressure Groups

SAS focuses on lobbying for cheap access to space; SFF pushes other "frontier-opening" work as well and tries for media coverage. I'm a member of SAS.

Other non-profit groups

Startups

Yeah, well, see my notes from the Space Access '05 convention.

Market survey

Jim Kingdon has a summary of a study of near-term markets for space launch services here (it's "only" 14K).