FYI, many of us have uploaded mp3s from time to time to share with others. Someone recently used Putfile.com. I tried it and found it to be great.
1. No goofy countdown timer, tons of ads, special codes, pages to click throught to get to the file, etc for people to listen. You can give the listener a URL to a page of all of your uploads or a URL right to a specific file with a player embedded on the page.
2. Listener can listen but not download. They sell a product for downloading. This is good and bad. Good if you want to put files out there for others to hear but not take. Bad is you want the user to take files.
3. MP3 and Video files only.
4. 25MB per file
5. No limit on the number of files.
6. It's FREE