Random Winners one allows users to subscribe to a list, and then gives you the ability to pick a random winner from all subscribers.
There are two scripts in Random Winners. The first allows your visitors to submit their email for inclusion in a random draw through an AJAX form on your page. The second is like it, except users can submit their emails to your draw by sending a message to an email account with POP access.
The script must be set up to check the pop account periodically, either through a cron job, or by inserting it in an image tag on your page.
If there is a pre-specified keyword in the subject line of the message, then the email sender is added to the list.
When it comes times to pick a random winner, the administrator can use the built in random function to make the choice.
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My personal experience with MP3 Database is in a word: AWESOME!
There is much to be said about unobstrusive, practical, and functional scripts and their authors... MP3 Database just plain and simply: Gets-The-Job-Done.
I've looked at other alternatives such as: JamRoom, it's an overkill, while MP3Database does not have all of the bells and whistles of jamroom, you can be up and running in no time -- again... unobstrusive, practical, and functional, like sweet life!