What Uros said
Last recording I did was a promo for a rock band, used 2 mics (CAD Equitek e200 and Sennheiser MD421) on the guitarists cab so I just panned those 100 L, 80L (Fender strat).
I recorded the entire band at once, with the vocalist in the control room where I simply monitored the session with my headphones during recording so I didn't have bleed on the vocal mic from the monitors.
After each song the guitarist dubbed the rhythm guitar parts with a Gibson LP, panning them 80 R, 100 R.
Then the melodies, harmonics and solos were dubbed at my place using GTR3 and SansAmp. Which are open to any panning or creative use in the stereo field.
WIth some of Uni's solo's we went far with the panning and placing of certain guitar effects and solos.
Things that work well for me is using different guitars and/or different amps for each side. Different amps isn't a must but in some cases it can create huge differences in clarity, size, amplitude stacking, etc.
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(next time I'll put those overheads a little closer, using the same ones though; Neumann KM140's)
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(watch the headphones, simply plugged into a spare headphone amp that's connected to the 2 aux's on the console for talkback/monitoring)