, is a "massively-multiplayer musical game" from in which you perform songs by blowing into your iPhone's microphone. You can compose your own songs and publish them for other players to listen to. You can also judge other people's playing abilities. Version 1.5 capitalizes on iPhone 3.0 with a "Duet Mode" that works using peer-to-peer Bluetooth networking. Achievement Alerts are also offered, using iPhone 3.0's push service.--

An updated version of that takes advantage of iPhone 3.0 features hasn't appeared in the App Store as of this writing--developer says it's been submitted to Apple for approval--but the free speed-trap locating app figures to take advantage of the new developer tools in two significant ways. First, the ability to embed maps directly into applications helps Trapster launch faster. The app launches in 8 seconds now, Trapster.com says, as opposed to 24 seconds with the old version, which had to use a Safari Web view and approximately 1,000 lines of JavaScript. Second, Trapster users now get push notifications as they drive, saving them from having to keep the app open to get speed trap alerts. Previous versions of Trapster relied on text messages to update users--a solution that Trapster.com conceded was both inelegant and expensive.--