MP3 Music Download Pro, currently sitting pretty at #4 in the US Android Market's Free Apps sales list. This is a bit of a thorn on the side of the Reichstag Recording Industry Association of America, because in the right light, taking all things into account, calling a spade a spade and generally telling it like it is... it's a piracy app. When asked to remove it from the Market, Google refused, stating that the application could be used to download legal music as well.