The Space Access Updates (the early issues were called DC-X Updates or News) are provided to the network community by the Space Access Society, one of the principle groups working to bring about cheap reliable space transport.
These updates are a detailed political and test history of Single Stage To Orbit (SSTO) starting with the SDIO's SSRT program.
Most of these documents appeared in Space Digest. There has been a great deal of discussion of SSTO in those electronic pages over the last four or five years (and even further back, discussions of Gary Hudsen's Phoenix E). Those interested in the pro and con arguments of times past will find a wealth of information here.