Saw him on the G3 tour and holy shite, blew Satriani and Morse right out of the water imho.
The playing, the showmanship...very over the top, but not in a "I totally take myself serious doing this crazy stuff" manner. Just amazing, blew me away.
Now I wanne see him on a solo tour so bad.
About that thing you describe, I can enlighten you I believe. When he does that he is using a sustainiac neck PU to get infinite sustain (basecally just controlled feedback) and uses the blowing to get the harmonic like Itamar101 said.
Btw I have never ever seen a human being abuse a whammy bar so hard...I was so afraid he would snap all strings at once xD