If your cabinet is mono and your tracks allow:
Micing a 4x12" cabinet :
SM57 upper-right with pan R
SM57 bottom-left with pan L and between 10-15ms delay
LD mic few feet out (Watchout for phase)
Most of the time the SM57's will do just fine for the distortion parts, and the LD condensor comes in habdy when playing those clean parts. This one really thickings things up.
If you cabinet is stereo and your tracks allow :
double that sucker (ouch, 6 tracks, I have done that often though)
If our cabinet is stereo and your tracks don't allow:
1. Submix the above to 2 track or 3 track
2. Use the same setup as mono, without the delay
Worked great for me.