My new favourite OH method is referred to as the "Recorderman" technique. Uses matched cardioid LDC's, one over the snare/hats/tom1 area, about a foot over the drummers head, dia pointing straight down. The second one is behind the drummer, behind the floortom, dia facing forward, at about eye level. It sounds kinda weird, but it actually rocks. Really nice wide image, and actually has excellent phase relation to the close mics.
Regarding micing with few mics, the smallest I've done is 3 mics. A beta52 on kick, about a foot out front aimed at the hole, an EV Cardinal on snare (I LOVE this mic for snare!!!), and an Apex 460 in cardioid/omni in front of the kit, a few feet out and a foot or so over drummers head. I used this setup to record a noise rock album for The Taste of Piss (
http://thetasteofpiss.bandcamp.com). Aside from not quite having the ummmph of the toms that I would have liked, I was pretty happy with the over all kit sound.