Windows 7 now includes ISO Image burning straight to disc, but what if you want to mount the image and not burn it?
This functionality is still not built in, but this tip: http://droptips.com/mount-an-iso-image-under-windows-982000xpvista does work fine on Windows 7, too!
If you do want to burn the ISO image to disc, then please see: http://droptips.com/burningwriting-an-iso-image-under-windows-7