Photoshop is probably the most important app to learn outside of FCP.
The best Color product on a Mac is Color. If you have any good color grading facilities near you, go spend a few hours with a colorist if you can and pepper them with questions about what they do and why. Watch a bunch of movies paying special attention to the coloring. There are some great books out there about the theory of color and are quite handy.
I have a DVD here on the Cow that will get you up and running in Color very quickly.
In order, the software we use the most are:
FCP
Photoshop
After Effects
Color
DVD Studio Pro
Motion
Soundtrack Pro
Walter Biscardi, Jr.
Biscardi Creative Media
HD and SD Production for Broadcast and Independent Productions.
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STOP STARING AND START GRADING WITH APPLE COLOR Apple Color Training DVD available now!