Do you need to do presentations, live demos or teach with your Surface then you probably need ZoomIt. Written by Mark Russinovich, here is how he introduces it.
ZoomIt is a screen zoom and annotation tool for technical presentations that include application demonstrations. ZoomIt runs unobtrusively in the tray and activates with customizable hotkeys to zoom in on an area of the screen, move around while zoomed, and draw on the zoomed image. I wrote ZoomIt to fit my specific needs and use it in all my presentations.
ZoomIt works on all versions of Windows and you can use pen input for ZoomIt drawing on tablet PCs.
It’s a great tool and you can use your Surface Pen to add ink over your live screen shots. Oh – and it’s free.
If you just need to magnify portions of the screen you can use the built-in Windows Screen Magnifier, but being able to ink on the screen makes it well worth the tiny download.