MusicRadar.com has a brief post on miking tips for acoustic guitar. They discuss using one and two condenser mic setups.
we’re not going to just mic sound from the guitar’s soundhole – the results would be too bassy. Both low-end and high-end tone emanates from your acoustic, but from different places. The low-end is mainly around the soundhole area while the higher end sounds will be around the area of the 12th fret.

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I never would have thought to use two mikes to balance the bass and midtones with the treble. I would have never thought to include mixing the pick-up with a mic. I don’t get why some guitarists record while playing towards the corner of the room. What acoustical advantage does this bring? Nothing was explained in the article. I guess I’ll have to try that to see why. Nice article.