Hello,
Being a C# developer, last year I worked on one of the challenges hosted by Innocentive which required developing a tool to find annotations in a PDF documents, allow them to be modified, and add them to the corresponding pages in another PDF document. I developed this application using C#, WPF, and iTextSharp library.
As it seems that, you also want to develop an application to process PDF documents, I would like to go through more details of the project and see if I can help you with the same.
Please reply to this proposal, if you find it useful.
Regards,
Atul Rajdhar