Pure science Wiki is a wiki for the pure scientific method, without any academic prestige-obsession. It is not exclusively about space colonization or even exclusively about space, but it has got several good astronomy articles relating to possibilities of better methods for space travel. Such pages include the articles "Warp drive" and "Variable speed of light" on the topic page "Space". Its ideas about how to make science affordable to anyone can also be used to make space colonization cheaper.
Now, Pure science Wiki is being disassembled. Instead, ideas about improving science can be found att http://gettingsciencegoingagain.blogspot.se/ (in English despite its .se ending).