Scott,
If it is basic photo editing which includes cropping, getting rid of
red-eye, getting rid of spots by blending and such, then the iPhoto
should do the trick for you. This app comes bundled with your Mac
and is quite powerful for editing and organizing digital photos.
Otherwise, Adobe PhotoShop is probably the best thing out there for
their purposes. There is a somewhat watered down version called
PhotoShop Elements that can do some pretty good editing as well. I
would first check out iPhoto as it is free but if it doesn't meet
your needs, move on.
Later...
Tim Kilburn
& Carter the Canine
Fort McMurray, AB Canada