The People's Science. Forum for scientists to communicate their research to the public.
Neurosynth. Huge searchable database for fMRI results.
Data Visualization Tools. Links to pretty awesome looking data viz toolkits. I've only used a couple of them.
Floobits. Plugin for Sublime Text 2, emacs, vim (also with a web interface) that allows simultaneous collaboration (think Google Docs for coders). Have not had the chance to use it personally, but I'll update when I do!