If you haven't downloaded the GIS 2011 iPhone App....DO IT NOW! The beauty of this app is that every time you open the app, it will update itself. This morning I opened the app for the first time in about a week and there were plenty of fantastic updates.
Under the "More" tab at the bottom, they have added "Local Places" This gives a categorical list of entertainment and food from Steakhouses to Comedy Clubs! GREAT addition!
Under the same menu (More), they have also listed "Downloads". You will have the ability to download information from vendors during the trade show directly from your phone. These docs will go to your downloads folder. No more carrying around 10lbs worth of paper.
One other great feature is the "Friends" section. This seems to work somewhat similar to Twitter/Bump combined. When you meet a fellow colleague, open this app to the "Friends" portion and hit the plus button. When doing so a menu will slide from the bottom. Select "Request a Code" This will provide you with a 6 digit pin to give to your colleague. You can now follow what your "friend" is doing during the show.
The Maps section is also slowly adding new features as well.