I think the playstation skew that this site has is pretty apparent in a thread like this, and I mean that with honesty, no disrespect.
Case in point, R1 and R2, make absolutely no sense to me, and RT would mean Right Trigger, not Right Top. I much prefer RT (right trigger) and RB (right bumper) and wish PS3 manuals would use those designations.
I also don't think those buttons are used for the same thing...in Uncharted the right top shoulder button fires, not the right trigger...