Found this on a Sound on Sound thread if you’re looking to kill time away from your recording setup:

Library of Mic Positions
So with electric guitarsssssss, you have a bunch of different wavs of a 57 recorded at various distances and angles. A lot of it’s probably stuff we’ve messed around with at home in some respects, but it can get pretty detailed with other instruments most of might not have spent as much time with, like piano and horns.

He digs into multimic setups as well -
Anyways, likely a bit more educational than a twenty page Gearspace shootout.