If you have an Android enabled device, you can use AutoCAD WS for the Android… even on your mobile phone.  Imagine the ability to zoom, dimension and reference designs in real time via your phone.  Best yet, it’s free.

Check out the following video:

http://www.youtube.com/watch?v=LC0KCznTAAw

I find many offices have begun to use it as a mobile device to review drawings in the field.  This program can be downloaded from the Android Market.

Also you can use it on your PC as well…also for free:

https://www.autocadws.com/