[Glice]

Jandek is a good call, although his guitar sounds more like he's left it in the baking sun for the summer than he's deliberately changed the tuning.

A lot of the Congolese Soukous peeps tune their guitar with a .12 where the D string would usually be, then tuned to F (If memory serves)... it's a kind of banjo type effect.

Seaweed cribbed a load of tunings/ ideas from SY.

Urusei Yatsura had a few guitars all in E's or F's.

Fernando Sor (18th Century classical chappy) had a few odd tunings, bridging the gap between the lyre and the guitar.

We haven't mentioned Glenn Branca yet, have we?

An awful lot of Celtic guitar peices were written in open tunings, much like the blues tunings Atari posted.

Blugrass often changes the D, G or A string to a higher guage to play melodic lines next to the basslines (another banjo emulation).

My Cat is an Alien seem to do lots of weird tunings, but they also do lots of strange things with guitars anyway (more so than SY). See also Keith Rowe (AMM), Henry Cow, Phill Niblock and the more experimental fringes of prog/ psyche.

There's a rich tradition of different tunings in most non-Anglo/ American music, far too many to mention here...