Check out this article on incorporating in other states.
http://www.allincorporation.com/article.asp?ID=590&CenterID=31&CatID=1799
The article seems to just mention 2 hot states for incorporating companies. However for REI, NV is the better of the 2. One thing NV has that no one state has No I.R.S. Information Sharing Agreement which allows for better tax savings and planning