I think it would be cool if Windows could mount ISO images natively instead of just buring them. There are a bunch of apps that already do that, but having the basic functionality built in the OS would be a good light weight alternative I would appreciate (just like the current ZIP support). If you want more power you can always install a third party app, but for most computers at work I only need to read a few ISO images once form the server when doing clean installs or upgreades.