>The only one we've used is IText (http://itextpdf.com/) .
>I didn't find anything that I needed (including graphics) that it could not do.
>It's open source under AGPL licensing but you might have to buy a license for commercial use.....

I have itextsharp.dll which I use to read PDF which are saved as fillable format to get the list of fields and update them. I believe that library comes from that Web site. If that is, then, this is the only library that I need to drop in the bin directory. This is a 3.36 MB file and seems to include it all. I might want to update the version however. Is this the same library you have used?