If you find yourself making a couple presentations a year or a month, I would recommend purchasing the Logitech 2.4ghz Cordless Presenter. It run’s under $45, Amazon: http://tr.im/iTm9, and frees you from being in front of or near your laptop. A USB connector, neatly pulls out of the back and plugs into your computer and sliding the on button on the remote to On allows you to connect with PowerPoint, Keynote or your favorite presentation tool. It allows for forward and backward movement as well as a built in laser pointer to assist in focusing the audience’s attention and parts of your screen. There is also a built in timer, which you can preset for a time limit and the remote will buzz to make sure you know you are running low on time and its time to wrap-up. I’ve plugged it into Macs, PCs with XP and Vista and no software is installed for quick use in case you are presenting from a client site. The display also displays how much battery life is left and it lasts approx 6 months based on your usage.
I’ve tried several other remotes over the years and found this to be the perfect size, feature set and ease of use to be able to quickly use during daily presentations.