how/where can i make my songs and recordings available for people to download for free? or how can i send a song via e-mail?

ex: i want my bandmate to have a copy of one of my songs so he can work on vocals, but the only way he can listen to it is if i post on here or myspace or if i burn a copy for him (not very cost effective).
email - you would have to use the "attatch file" option
internet - use a site like zhare.com or megaupload.com, upload your music file, and then give your bandmate the download link