iPhone/iPod touch: TouchMouse is a free application for the iPhone/iPod touch that, when paired with its accompanying control software on your Mac or Windows computer, turns your touchscreen into a mouse and keyboard.

Once you download the software to your iPhone or iPod touch and pair it with the server software—Logitech has versions of the TouchMouse Server software available for Windows XP, Vista, and 7 as well as Mac OS X—you'll be able to use your device as a mouse for controlling your computer. The interface allows you to click the mouse buttons, move the cursor via the touch screen, and pull up a small keyboard to enter text on the computer.

While such an arrangement isn't a practical replacement for a full-out wireless keyboard, it is a great tool for presentations or for pairing with one of the awesome media centers we've highlighted. If you have another app for turning your iPod touch or iPhone into a remote or clever things to do with them once you have them set up as remotes, let's hear about it in the comments.