If you've gotten over the initial reactions to OmniDazzle and are considering actually using it, you might find Jeff Gamet's review at The Mac Observer useful. OmniDazzle, as you may recall, is a presentation tool that highlights your mouse cursor in a variety of mesmerizing ways, making it easy for others to follow along and focus without missing a beat.
The pros? Easy to use, lots of eye candy to choose from and works nicely with Keynote. The cons? Limited and in some cases no support for older Macs due to video card requirements. Check OmniGroup's requirements page to see if your Mac supports it. You'll need Mac OS X 10.4.6 and a Core Image capable video card. Also, too many not-very-useful styles. Check out the full review for more details.