http://www.cutepdf.com

Now you can make PDFs without buying the full Adobe Suite for some £160 /$299. In fact the software is free and although the set up is a little strange (you have to install a virtual printer) it is a good tool for anyone and it allows you to make PDFs from any application with aprinting ability.

No watermarks, no time limit, no worries.

See also: http://www.lancs.ac.uk/iss/fileconv/acrobat.htm