Understand. I don't have an electronic version of '11 and wonder what he is using. I have to go on-line to view '11.
(We are not on '11 yet so I only reference in regard to the Forum)
Other than opening a pdf file I think using NEC plus is about all you are going to find. It is closest thing you will find to the older CD-ROM versions of NEC, but is web based so you need internet access to use it as well as a paid subscription. But can use from any browser all you need is to know your username and password.
It is somewhat easy to not realize which edition of NEC you are browsing and you could be in anything between 2002 and 2011. You need to look in upper left corner of the page to see which one you are in. (you do have option of toggling on/off the handbook commentary) You also could possibly be looking at one of the last 4 editions of 70E instead of NEC.
There is free demo, like one or two days. Also included is notations and explanations of changes from previous code in the places where changes were made, links to ROP's, links to related UL white book info near different code sections, and the home page has news and other NFPA content.
http://www.necplus.org