Yesterday I was lucky enough to goto the Microsoft TechDays 2008 and aside from the technical information gleened from it, I was amazed at how many presenters were all using the same presentation utility called ZoomIt. This wasn't my first conference where I've seen a large number of presenters all using this tool, it's been out for a while.
What's the biggest advantage of using it? Think of it like having a massive magnifying glass on your PC to zoom in on a specific piece of information you want your audience to pay special attention to. Yes, you probably did increase you default font in Visual Studio, PowerPoint, or what ever else, but what if you STILL wanted to point out something on the top right hand side of your screen? Maybe you want to specifically point out special values in a property window? You could use ZoomIt to dynamically draw the audiences attention to that area. I've seen it in action and it's very cool!
If you are doing any type of presentations, this is a highly recommended tool to at least look at.
Resources:
Mark Russinovich's ZoomIt: http://technet.microsoft.com/en-us/sysinternals/bb897434.aspx (Version 2.2 as of Nov 12, 2008)