If you give many presentations on the Mac, chances are you’re using Apple’s Keynote presentation software. One cool feature in Keynote is the ability to demo something on your Mac without giving away your next slide or notes. When you’re in the middle of a presentation, just hit the “h” key on your keyboard. This will hide the entire Keynote application and show your desktop.

When you press the h key, the Keynote icon in the dock will change and include a play button. When you want to resume your presentation, just click the Keynote icon in the dock.

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Handbrake is one of those applications that we adore here at TUAW HQ. It makes converting DVDs into a variety of digital files a snap (though only use it with DVDs you own. Don’t be pirates, kids). Chris Breen, of Macworld fame (and an amateur astronomer it would seem) shows us how to use HandBrake like a pro. Breen goes a step beyond ‘use the presets’ and delves into what many of the options HandBrake offers up actually do, and how they impact your files.

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Flot is a pure Javascript plotting library for jQuery. It produces graphical plots of arbitrary datasets on-the-fly client-side. The focus is on simple usage (all settings are optional), attractive looks and interactive features like zooming. Although Flot is easy to use, it is also advanced enough to be suitable for Web 2.0 data mining/business intelligence purposes which is its original application. The plugin is targeting all newer browsers.

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Google has finally released Google Charts API, which returns a PNG-format image in response to a URL. Several types of image can be generated: line, bar, and pie charts for example. For each image type you can specify attributes such as size, colors, and labels.

You can include a Chart API image in a webpage by embedding a URL within an <img> tag. When the webpage is displayed in a browser the Chart API renders the image within the page.

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There are many of these kind of tools around, but I quite like interface on this one. The randomise feature is also quite useful.

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