ZoomIt (by Mark Russinovich), a classic tool for presenting. Quite lightweight with few but good options. The zoom capability allows you to zoom into the area of the screen where the mouse points to. The draw and type capability allows to draw and type on your screen. Way cool if you are using a Tablet PC, though. Finally, the Break function is a countdown. Nice for speakers this one comes with a few nifty functions such as playing a sound and displaying a custom background image.
And no, it’s not a tool only for evangelists giving talks in large lecture theaters. It also comes quite handy in meetings and presentations within the team and in front of customers.