Vringo is a service which allows you to create video ringtones for your Blackberry. Vringo is seeking out beta users to help further the advancement of the application to other devices and collect feedback - this is one of the best reasons to have a public beta. Currently, only the BlackBerry Bold is supported but with your help Vringo is hoping to gather enough feedback to move development to other devices as well.
If you're into the concept of video ringtones and have a BlackBerry Bold be sure to check it out and please -- if you download and use it, provide feedback to Vringo to help make the application even better. Consider the fact many applications are closed betas, to get in on a public one is a great thing!