Zamzar is an onine service that converts files from one format to another. PDF to DOC or HTML, MP3 to WMA or AAC, BMP to JPG or TIFF, VOB to MOV or MPG, RAR to CAB or ZIP. Free version comes in two forms: registered user or not. Not registered users upload files and get a link back in email (that you provide when you upload the file) to download the converted file. Registered users can maintain multiple files on the site. Then there’s the paid accounts. But try out the free, unregistered service first.