i use PDF Creator. free. open source.
<a href="http://sourceforge.net/project/showfiles.php?group_id=57796&release_id=173100">here</a>
(its in the pink section of the page... download the .exe unless you want source code.)
it's pretty cool. after it's installed, you "print" it to pdf by selecting it as the printer. then a dialog comes up for where to save, name of file, etc....