http://www.zamzar.com/This site is great for the people who want to convert one filetype to another type and don't want to download anything. Zamzar converts music, text, video and image files (ex: aac to mp3, avi to mp4,
all formats) and then e-mails you the file as an attachment. If they don't have your filetype you can request it and they'll try to make support for it asap. I tried it, and Gmail scanned the file, which was virus free, and it worked great. It took about 10 minutes to upload the file, for them to convert it, and then for me to get the e-mail. Great service. Highly recommended.