Shameless plug: if you look at the package with Pacifist (link in my sig), you can see the exact path where those files will be installed. Just Get Info on the file, or you can just add the path onto the Default Install Location in your head.
Googling for iidsetup and libiid didn't turn anything up, so I can't tell you for sure, but my guess is that you should be able to safely delete all the files that have "iid" in their name as they seem to be part of the third-party software being installed. CpMac is indeed part of the Apple Developer Tools, and although it won't harm your system to delete it, you should still keep it around. I'm not sure about the other stuff.