Scribd, I want to use iPaper on my own site without using your servers. I think it will be beneficial to my customers. Since you took millions of free code for parsing all these pre-existing document formats, don't you think you owe to the community and should release your convert-to-flash code as well?
I know that GPL only covers the case of "distributing" software and running it on your own servers releases you from an obligation to give something back in return.
But does it really justify your behavior of being a parasite?