Zamzar.com is a free online file conversion service that couldn't be easier. It converts image, document, video, audio and pdf files. Upside is it's easy, free and it works on over 75 kinds of files. Downside is it could time time, although they are adding servers to speed things up. Needless to say, you don't want to use it for confidential documents. You also lose "control" of PDF content since they can be converted to Word or Open Office, but give it a try!
How easy is that?