Source Control or Source Safe set up for XSL? Configure CVS or Microsoft

I seem to now have too much XSL code with me. 

I would like to have some kind of source code repository that supports
XSL, the ability to do builds & releases (even though I know that it
would be interpreted/compiled on execution, the ability to ROLLBACK to
previous stable states of an XSL repository or nested / linked XSL
library would be very important. 

Any advise? I googled for it but was unable to find anything.

Thanks,

Abhishek
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Abhishek Sanwal
HP - Houston Campus