I recently found the Microsoft Virtual CD Control Panel which is an iso-mounter for Windows. This has worked well for me on both W2k and WinXP on several different computers
Like the other commenters, there’s some ISOs I have found that won’t mount with this utility, but do mount with (for instance) Alcohol120%.
On the other hand, this is free, Alcohol120% is not, and the Alcohol guys have recently made their licensing much more onerous (the license breaks on my Sony notebook every time I go to use it. grrr).
On the third hand, this is a great free companion to the free ISOCreator and free ISORecorder
Who doesn’t like free?
On the topic of free, and making things that are not-free into free, we like DVD Decrypter for making an CSS-free ISO from your protected DVD.
Then you turn that unprotected DVD into a movie you can copy to your iPod with handbrake.
