Great to play with and demonstrate diffraction....
You can get a solar spectrum from the reflection....
In Tonkin's "Practical Amateur Spectroscopy" there's a chapter on setting up both the CD and the DVD disks to obtain spectra.
IMHO they're of limited value for any scientific measurements.
(Google CD spectroscope...plenty of links there)
A Paton Hawksley 100 l/mm grating which comes mounted in a 35mm film frame is better but then you face the issues of fitting it.
OK as an objective grating (mounted in the lens hood of a standard lens on your DSLR) but a bit more difficult to fit to the scope.
I have some telescope mounting frame designs available over on the Y! group astronomical_spectroscopy forum.
Hope this helps....
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