Michi sent me these arc pictures that were made using this circuit.If I have enough webspace left, I'll add the full-sized originals.
He has also been able to audio modulate it to produce a singing arc effect.
Derek Woodroffe has used a similar circuit, minus the TC4429 chip, to generate HV for a 3" Tesla coil. 3" isn't the secondary diameter, though, it's the height of the entire coil 8-0 See it Here
VCore has also had some success with a half-bridge version driven by the trusty 555 chip.
Click Here to read the 4hv.org discussion thread about this circuit.