No dance skills required to join the latest mob phenomenon. Cash mobs have arrived in Minneapolis, and all you need to get involved is $20 and a desire to support small local retailers. It works like this: shoppers set a time and date to visit a particular store and pledge to spend $20, guaranteeing a cash infusion for a retailer that could really use it. The Twin Cities' first cash mob took place last week at Minneapolis eco-store Moss Envy. Read all about it, and the origins of the movement in the Star Tribune. The next cash mob is scheduled for Saturday, March 24. Vote for the Twin Cities store to be mobbed and get ready to shop.