The ISO Recorder Power Toy is a cool tool written by MVP Alex Feinman. It allows you to read and write ISO images to/from CDs. Thus, you can grab an ISO image of a CD, store it on a disk, and later burn the ISO image. A simple tool - but most useful.
Sadly, this tool does not work on Windows Server 2003, which has updated the CD burning facility. The tool only works on Windows XP.