iText based pdf mail-merge
http://en.wordpress.com/tag/pdf-to-notes/
I know that there are many commercial pdf products but SimplePdf is open source project and therefore it's not reasonable to compare it with them. Maybe you though "PDF to Notes & Notes to PDF" is free… I did too..
I must say, I do like how you created the PDF while in memory rather than having to create files on the user's PC only problem is that it tends to slow down the application by doing this in memory maybe you can spped it up somehow?
Thank you for feedback! I still need to do some work with performance. My first goal was to make working code, so memory management is very poor now. If you find/know good ways to improve speed, just let me know so I can fix it.