I was a winner (actually I think it was an honorable mention) in Owen Linzmayer's "Great Apple Programming Contest" for my entry, which consisted of about 512 bytes of 6502 machine code which turned the Apple ][ Keyboard into a rudimentary musical keyboard. It was a bit whiny sounding...
While we're on the subject of Photoshop, I highly encourage you to try Lightzone as an alternative to Photoshop for working with fine photographic images.
The CS3 upgrade for Adobe Photoshop Mac is, like, due any day now.