How about a program installation tool that guides you through installing software. It could monitor all installed files and offer to automatically clear them from “my pending files” after review. (I would like to know what has been installed - especially stuff dumped in system32).
This would make “my pending files” much easier to maintain.
It could look at autorun.inf and (optionally) automatically start when an installation CD is entered to make it easier for the average user. Experienced users could just use it to select the installation program.
It could also (optionally) put the new application into temporary training mode so its behaviour could be learnt by defence+ (for those who like paranoid mode?) and automatically make the install program an “installer or updater”.