It’s not the value of the dollar; that graph is charting live audio.

SignalScope is a real-time signals analysis program that displays information about the structure of sound. Audio/video professionals, musicians, engineers, and scientists could use it to measure frequency, waveform, and other audio attributes, displaying that data in graphs on the iPhone.

Time Machine, Time Capsule, and the proliferation of affordable and large-capacity external drives have finally gotten it through the general population’s heads that backing up your data is important. After all, every Mac has a hard drive, and every hard drive will one day go belly-up, so you might as well be prepared. But besides backing up data, it’s smart to keep your hard drive in tip-top shape with regular maintenance, and that’s where Drive Genius 2 comes in.

Video sites that are full of user-generated content have made producers out of anyone with an internet connection -- but uploading a video of your dachshund barking the theme to Night Court is a far cry from broadcasting live. Up until very recently, live web video was more akin to a jittery slide show.

Fortunately, the Advanced Products team at Yahoo! quietly launched Yahoo! Live, a free web app that allows you to use your Mac’s built in camera and microphone to broadcast your own live video and audio. Since its launch, Yahoo Live! has been streaming all sorts of content, from an Obama rally to a live episode of Diggnation (which proved to be a bit too popular, temporarily crashing the still-experimental service). Read on and we’ll show you how to get started broadcasting your own show.