Microsoft has a free PowerToy that does not show up anywhere on the Microsoft Download Center yet provides a simple way to mount ISO images. The Virtual CD-ROM Control Panel for Windows XP will mount a number of CD image formats, including the popular ISO, as a virtual CD drive making it possible to use data on CDs even on any computer that does not have an optical drive. The utility is unsupported but I have been using it with no problems.
(via Digg)
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