From the website:
ISO Recorder is a tool (power toy) for Windows XP, 2003 and now Windows Vista, that allows (depending on the Windows version) to burn CD and DVD images (DVD support is only available on Windows Vista), copy disks, make images of the existing data CDs and DVDs and create ISO images from a content of a disk folder.
ISO Recorder has been conceived during Windows XP beta program, when Microsoft for the first time started distributing new OS builds as ISO images. Even though the new OS had CD-burning support (by Roxio), it did not have an ability to record an image. ISO Recorder has filled this need and has been one of the popular Windows downloads ever since.
With an advent of Windows XP SP2 and Windows 2003 the version 2 of ISO Recorder has been released, which introduced some new features including ISO image creation and support for non-admin user.
Finally, in Windows Vista it became possible to address another long-standing request and provide DVD burning capability.
Since the very beginning ISO Recorder has been a free tool (for personal use). It is recommended by MSDN download site along with Easy CD and Nero and is used by a number of companies around the world.