I stumbled over this a week ago, shortly before leaving for hollydays. It's probably the most extensive site on spaceship-design and SF-compared-to-reality I ever encountered, allthough the author is not a scientist. No matter if you just want to get some facts and ideas together to make a new ship or create a complete Sci-Fi-scenario, this site won't let you down!
http://www.projectrho.com/rocket/index.html
-Edit: sorry, I meant "site", not side... :?
http://www.projectrho.com/rocket/index.html
-Edit: sorry, I meant "site", not side... :?