Calibre 0.6 is supposed to be out soon as others have said. Last I heard was late May / Early June. However, it does support PDF conversion in its current form and it is free. Go to:
http://calibre.kovidgoyal.net/download
Download it, and convert a few pdf's. Calibre has a built in viewer and you can use your PC to view them in the converted format and see what they look like. If they aren't good enough, wait till 0.6 and you'll have another shot.