Guides
Kotaku
Gamespot
The gist of it: Sony has hammered out deals with Activision, Harmonix and Konami so that the instruments for any one forthcoming music game will be compatible with the other two. You only have to buy Rock Band 2 in order to play Guitar Hero: World Tour and Rock Revolution (not that anyone will).
I am extremely relieved to hear that someone at Sony has been paying attention to the collective bemoaning of us wannabe rockers and not just to the sounds of cash registers going off in their heads. I was dreading late October because of the prospect of having to spend upwards of $400 on fake instruments, and the sad thing is that if this annoucement had never come I actually might have done so. I hope compatibility with current PS2/PS3 Rock Band instruments gets hammered out in time as well, and I will actually be living on a prayer until it is. :P
