One for those of us based in Spain, and a a great implementation of the wiki concept. The top-rate 902, 901 and 806 numbers in Spain are used mercilessly by customer service departments and really help ramp up the phone bill. Well, it turns out that for most of these numbers there is usually a cheap local rate alternative. nomasnumeros900.com collects these in their wiki and lets you search for them from their homepage. Worth bookmarking I think!