Hmmmm. Two ideas. First, you might consider putting them up on website from which people can download them. For example, on .mac you can create a downloads folder accessible by password.
Or, if you don't want them all available for dl, you can use iweb to create a separate page for each tune (or group of tunes), each page being protected by its own password. When you want to send a tune, you just send the website (like, web.mac.com/yourname/tunepage1) and a box will come up when your friend tries to access it. Just send along the login and password for that page). For what it's worth, I do that with clients, where I have many large files that they might need to access. I just created pages for each of them, with clickable filenames that will download the files, and each has its own login and password. Works really well, and they can download it directly to their computer.
Alternatively, if your email host gives you fairly large quote, you could email yourself a whole lot of them and keep them in a folder. Then forward them at will.
For example, .mac uses imap, so you can create a folder called, say, mp3s, and keep all your mp3 emails in there. They'll be accessible to you from anywhere you can get to a computer on the net, or your phone itself. .mac gives you 10 gigs as I recall, which would hold a good lot of tunes.
Just a couple of ideas.
