Virtual Band Jam
Learning bass but all your mates play bass too? Show Me How To Play has had the great idea of setting you up a virtual band to practice with. With a pile of tracks to download, you can freely toggle your instrument on and off, to use it either as a tutorial, or to play along with the rest of the band. There’s a lessons section too, but i just loved this MultiPlayer idea. Be great if you could web-cam-jam with ‘real’ people though 
