PDF generation library for C#

Hi,
Does anyone know a good freeware library for generating PDF document from C# code. I'm especially interested in employing such a library to fill some sort of document template using data retrieve from a web (ASP.Net) form.
Any help would be welcome.
krzysieq

http://csharp-source.net/open-source/pdf-libraries

did you manage to get any of those to work for the net?