I'm not familiar with CompuPic Pro, but Parker may find iPhoto to be perfectly fine. If not, then Adobe's Lightroom and Apple's Aperture are the two main photo software apps for Mac that I'm aware of.
I settled on Aperture 2.0 - made by Apple, works perfectly for my uses and integrates well with OS-X.
For more advanced photo editing, Adobe have recently released Photoshop Elements 6 for Mac, or there's always the full Photoshop CS3 for awesome photo power
