Does it hurt anything to upshift without using the clutch?

All that I have ever read has said its fine to up shift w/o the clutch. From what I understand the gears are set up so that they mesh up shifting w/o the clutch just fine.

I shift like that if I am accelerating really quickly.

If you do it correctly its fine.

i accidentally did it once and have seen no ill side effects

personally i feel it'd be worth it to buy an ignition module

No problems if you do it correctly.

I, like Exitwounds, usually only do it under heavy acceleration.

it wont hurt anything, the trans is a constant mesh type so the gears are always spinning or something like that. i up shift and down shift all the time not using the clutch and ive never had a problem i have 30,000 miles on my bike