Mitch Joel wrote an article called “10 Things You Need for Your Computer“.
His #10 was the Logitech Presenter:
The Logitech Presenter will be your secret weapon. There are other presenter devices available, but this one takes the cake. It has a built in count down timer that gives you a silent vibrate to let you know when you have five minutes left and another one when your selected time is up (never go over your allotted time again). The grip feels great and the USB receiver slides into the top of the device, making it extremely compact. You no longer have to stand at a podium and be tethered to your laptop clicking the spacebar for the next slide. The Logitech Presenter will turn the power and attention of your presentation back to where it matters most - you. The Logitech Presenter is $89 and is the only piece of hardware on this list for a reason.
