Go to
www.fineprint.com
You can download a trial version for free, then just send 'em your card details to have the fineprint tag disappear from the bottom of each document.
When you install the software, it's just like another printer, but it invites you to save the resulting file instead.
I've used this one for years at home and it works like a charm. I've got Acrobat writer at work and for simple .pdf creation fineprint does the job just as well for a fraction of the cost.
The fineprint printer dialogue is pretty good, too, if you want to do booklets etc.
Usual disclaimer about not having anything to do with fineprint applies!
Cheers,
The Odd One