Journal of Propulsion and Power - Site contains a searchable Table of contents and information for authors and subscribers. - http://www.aiaa.org/content.cfm?pageid=177
Chemical Propulsion Information Agency - Comprehensive site with technical resources, propulsion papers, meetings and events calendar. - http://www.cpia.jhu.edu/
Beginner's Guide to Propulsion - Tutorial slides on basic propulsion concepts. - http://www.grc.nasa.gov/WWW/K-12/airplane/bgp.html
A & E Engineering - Some advanced propulsion concepts described. - http://www.up-ship.com/AandE/AandE.htm