How do you sort your LPs?

Mostly by Classical vs. Everything Else.  Classical by composer but only when it makes logical sense.  Separate sections for boutique labels such as M.A. and Harmonia Mundi.  Operas and gigantic box sets on the top shelf because they collectively weigh less than single disc releases.  For aesthetic reasons, I sort the Opera box sets by record label.  The different labels all have their own box styles and it just looks better that way.  Oddball records, such as stereo test records and a single LP that is cut from the center outward toward the edge, have a single, special niche.

I've known folks who deliberately put their music collections in totally random order so that people who come over won't be able to choose what to put on.  As a matter of fact, I may have done this at one time.