Wallwishes
There are new Web 2.0 applications out every week and normally I take a while to sign up as I have to think about the pros/ cons first (an example was my 2 year lead-in to Twitter...). However, I didn't need to think twice about using Wallwisher, it is fabulous for keeping research notes. I just started a new wall for the 'Playground Games and Rhymes in a New Media Age' project, which should give you an idea of its affordances. If we all shared our research project notes in this way, how rich that would be?