Hi,
I downloaded and studied the code of cups-pdf and it made me learn something about cups. I wrote my own filter which at present does nothing but copies the postscript file to a particular directory. That too in just about 60 lines of code!!! All that took about 20 minutes :-)
I am planning to writ my own version of cups-pdf which can do following
1) Put pdf file in a particular directory or in user's home directory.
2) Send pdf file to the user who printed that file as a mail attachment.
This is a good learning experience. I like open-source.
VJ