To move files back and forth between a Mac and a PC, you can use the Mac's built in Web Serving feature. Simply turn on Web Serving on the macs control panel and choose "none" as the home page. You can then browse the mac's hard drive from an ftp application on the windows machine and perform uploads / downloads. Be careful however of file formats. You should only download files that have been compressed / binhexed so as not to loose the Mac file's resource fork.