As part of the Decidr and Widget Bitch tshirt series, I just published tag clouds don't work to the WidgetBitch CafePress store. Because tag clouds don't work. They're the UGG boots of interaction design: no one really believes in them but you see everyone else with them and you're like "ummm maybe I should" and then you just look like a mess and in 3 years you look back an you're like "oh god what was I thinking?" Be ahead of the curve.