ZoomIt is a free desktop zoom and annotation tool using which you can zoom a part of your screen. This comes very handy when you are giving some presentation. It quietly runs in the system tray and you can zoom into an area using some customizable hot keys. You can move around the zoomed area and draw on it.

On the first run, it presents a configuration dialog which allows you to customize its behavior like specifying the hot keys for zooming and entering drawing mode, selecting the size and color of the drawing pen. It also includes a break timer feature that remains active when you tab away from the timer window.

It is nice application and helpful while giving presentations. It is a freeware and runs on Windows XP/Vista.