I found this whilst browsing Tim Gowers blog. http://www.tricki.org/ Seems to be a project of Gowers, Tao and a couple of others and is just a week or two (?) old. The aim is for the site to act as a Wiki-style database of problem solving techniques/advice/tricks etc - rather than a database of definitions. I am not affiliated with the site (regardless, it is non-profit) - but i consider it a concept with such potential that i thought to try and increase awareness of it. It's very much in the start-up phase and so the more visitors/contributors the better. I wonder; if the PF community/admins shares my enthusiasm for the concept and the site perhaps it could be integrated in some way? Or even just stickied somewhere on the forums. Anyway - i hope it succeeds, and that PF members make us of it.