11/2/11
You can control a Keynote presentation on a Mac with your iPhone, iPod touch or iPad using the Keynote Remote app. But this requires that both the Mac and iOS device be on the same wi-fi network. In cases where you don't have a wi-fi network, such as a presentation hall or classroom, you can establish your own local network using your Mac, and connect to it with your iOS device. This allows you to control the Keynote presentation directly from your device to the Mac.
10/31/11
In your Mac's Applications folder you've got a Calculator app that you probably haven't given a second look. This is much more than a simple utility. You can use it in scientific and programmer mode, convert units, time and currency, work in octal and hexadecimal, produce a tape of your calculations, and even get it to talk to you.
