#2
Standard tuning, I believe. From what my quick glance can tell, he's just messing around with 7th and 9th chords.
Gear:

Guitars
Martin DSR
Taylor 214e
Fender Strat
Epiphone 335 Dot
Carlo Robelli Acoustic

Amps+Effects
1978 Fender Pro Reverb
Boss Blues Driver
Boss Super Overdrive
EHX Holy Grail
Boss DD-20 Giga Delay
#3
its half step down aka HENDRIX TUNING(the BEST tuning)
i could play like eric clapton if i had his gear...anyone could