The best online one-stop shop for your document converting needs is Zamzar. And the great thing is that it's free. I can vouch for its power. Recently, I had to convert a locked PDF document -- it couldn't be printed, so I wanted to convert it to Word format and then print it. Zamzar didn't have any problems converting it! All you need to do is upload the file, and Zamzar will e-mail you the converted file or its download link. The converted file resides in Zamzar's server for 24 hours.