For those going to RubyConf, it appears that WiFi is available at the
hotel, but it's only free if you sign up for Omni's (free) Select Guest
program:

http://www.omnihotels.com/Home/FindAHotel/Charlotte/HotelHighlights/WirelessInternetAccess.aspx

I signed up, then called the hotel to associate my reservation with my
Select Guest number.

--Greg