I prefer Dropbox. It's free (though you can buy more space if you need it I think), you can access any sort of file from any computer with internet, interact with it, and save it directly back to Dropbox. It acts just like an extra folder on your home computer. As an added perk, you can also use it to host images for linking to on blogs/forums etc (and then you don't give Mac and Medi a heart-attack by hotlinking here on AW! ).