Looking for good PDF Libraries

I am in the process of evaluating PDF libraries. My main objective is to be able to programmatically add interactive fields to a PDF document, and by doing so converting it into a fillable form. In addition to the regular text fields, check marks, etc. I need to add things like computed fields and JavaScripts.
So far, I have evaluated PDFlib and PDFNet.
What other PDF libraries are there out there?
Recommendations and comments are most welcome.
-RFH

I would just like to point out that although the PDF library and the Acrobat API have shared documentation, you do have to be very careful when you read it. You need to be aware that a lot of API calls in it are not available to the PDF library (there are some that are specific to the library). Of particular interest to this thread is that the AF form field functions calls are not available to the library. There is a good example in the DLI documentation from Datalogics of creating form fields at the PD and Cos level, but you should also be aware that DLI is designed for creating new pdf files and not adding or manipulating existing ones (although you can be clever and merge stuff afterwards). I have been working with PDF files since version 1 of Acrobat and having attempted using other 3rd party libraries which are probably easier to develop with. I now use the PDF library regularly and I wouldn't use any other library for PDF manipulation because of compatibility issues with the files generated.

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