Positronics Research, LLC - A research firm located in New Mexico, pursuing antimatter storage and utilzation for high energy applications in propulsion and medical arenas. - http://www.pr-llc.com/
Antihydrogen - A New Energy Source? - Explains why the answer to this question is "No." - http://ikpe1101.ikp.kfa-juelich.de/ps210/AH_energyE.html
When Isaac Met Albert - Antimatter propulsion: using Newton's 3rd law combined with Einstein's E=mc^2. - http://science.msfc.nasa.gov/newhome/headlines/msad12nov97_1.htm
NASA: Antimatter and Fusion for Rocket Propulsion - Fusion-antimatter hybrid space propulsion systems for fast transport to Mars and beyond. - http://www.science.nasa.gov/newhome/headlines/prop12apr99_1.htm