I know Blane just posted a good one, DADDAD tuning but here is a few more I tried and what i think of them:
- Db ADGBE : Just tried it then, it gives you that tiny bit more variety when switching between powerchords, very dissonant but kool. Sound great with wierd chords.
- Open "E" : Great for slide guitar, very bright and bluesy
- Open "G" : Even brighter again but has a warmer sound to it
- DADBGD (Double Drop-D): Not amazing but gives a better range for soloing
- EADBGD: Much like standard but with the the option of a few lower notes on the high E string (lol this is Gary Moore's favourite tuning)
- AADBGE or "Drop A": Very heavy and rumbles heaps but sound like poo if you hit it too hard, giving terrible fret buzz. Sounds great with fuzzy distortion (think Foo Fighters "Stacked Actors")
Trying to think of more i tried but yeah thats it for now