I seldom to never install the bundled software as 99% of it is junk. Given the options you have on a mac, and the fact that you have a couple pro apps, you shouldnt need most of them.
However, there is one you will need off that disk. I hadn't installed any of them and came across this problem - to update your camera with the latest firmware as they release new versions, you need the EOS utility (or whatever its called). I wouldnt however, install the other 10+ programs on the CD if your using aperature, iphoto, PS, etc.
Enjoy the new camera, I am loving mine!
- Chris