In my soundclick there's a track we did for a buddy going through recording school (Metal Edge Magazine)
SoundClick artist: Robert BB Wiggs - page with MP3 music downloads
Although it sounds like it, there's not a doubling in the rhythm or lead tracks. We close-miked the cab with an SM57, then put a Nueman mic about 10 feet away for ambient sound (in another track). The result was a nice doubling effect because of the space between the mics and the sound pickup.. Disregard the severe compression...he's was a student, after all.
(Note--I did add some lead guitar track in the chorus, chugging on chords and such).
An added bonus--with the second track he could add effects without messing with the original track.
Also--if you can throw another mic on and record a simultaneous dry track you'll thank yourself later--you can manipulate it to your hearts content with effects, etc., and it'll match the track perfectly since it's the same take!
Hope that helped.
BB