If you've got a large monitor and a lot of text to try and follow across the screen, a hotkey will convert your mouse cursor into a full-screen Crosshair cursor allowing you to underline the text you're reading. This is also extremely helpful in design work when trying to line up anything vertically. Hotkey again, and it restores your original mouse cursor.
I find using Alt+~ as the Hotkey to toggle on and off works great. This is such a helpful little tool!
CrossHair displays two full-screen lines intersecting your mouse cursor when you press a hot key. As you move the mouse cursor, the lines follow over any program or window. The program is tiny, and runs completely transparently until you call up the crosshairs. It's useful for eyeballing any kind of chart or tabular data on screen, and for aligning objects in graphics or design applications.
h**p://www.mlin.net/CrossHair.shtml