Ever had the urge to crank out some nasty riffs in the kitchen, record them, and then watch as millions of Xbox 360 owners rush to download your jam(s)? Don't lie. In a move that marks the next logical step of the Rock Band journey, Harmonix has confirmed that an open beta registration of the Rock Band Network will open up later today for Xbox 360 users, enabling amateur (or professional or novice!) musicians to record, convert and upload tracks to a network where gamers can judge how awesome / not awesome any given song is. Reportedly, those seen as "good enough" will be made available for sale (you can price each tune from $1 to $3), though w