TechCrunch is describing new UK startup Mixlr as ‘a sort-of Ustream for audio’. It offers an application for Macs (with Windows and iPhone on the way) that lets users plug in an audio feed to their computer, and then stream it out to the world via a URL that can be promoted on Twitter, Facebook and MySpace. It’s being pitched at DJs and artists who want to stream just audio of their live sets or performances – as opposed to video and audio, which companies like Ustream allow. Mixlr also works with SoundCloud to archive these performances. The basic service is free, with paid top-ups when people use up their set number of livestreaming minutes.