Ignore the above, if you want to share your own mixes on OSA, you need to upload to permanent webspace.
Sites like yousendit, megaupload etc aren't permanent.
If you have webspace with your internet service provider you could use that, or if you sign up to be a gold member, you get 500meg webspace with that.
Old Skool Anthemz - Announcements in Forum : The Chillout Room (it's cheap in January...)
You'll also need an FTP program to upload files with, here's an easy to use one..
SmartFTP - FTP Client