Propulsion
Links
Advanced Space Transportation Program - NASA MSFC
The Marshall Space Flight Center in Huntsville, Alabama, leads NASA's initiatives to dramatically improve access to space.
Breakthrough Propulsion Physics Program
http://www.grc.nasa.gov/WWW/bpp/
Experiments and theories regarding the coupling of gravity and electromagnetism, the quantum vacuum, hyperfast travel, and superluminal quantum effects.
Emerging Possibilities for Space Propulsion Breakthroughs
http://www.lerc.nasa.gov/WWW/PAO/html/warp/ipspaper.htm
article by Marc.G.Millis
NASA Jet Propulsion Laboratory Technical Reports Server (JPLTRS) v2.0
http://techreports.jpl.nasa.gov/
enter 'propulsion' into search and get 100+ reports
NASA Stennis Space Center
Where NASA tests rocket engines.