We're the official app this year (I am one of the creators of Guidebook)
I used a combination of a custom app and Conventionist last year (which was your app before it renamed Guidebook I believe?). Both were a gigantic help, and Guidebook looks to be looking even better this year. You guys are awesome!
Last year my OG Droid died on me Friday morning right before the show...ended up spending half that day shopping around for a replacement phone. No fun. Still had a blast at the show though.
Last year I stole a BU dorm room the girlfriend left for Spring Break, which was really, really handy. This year I didn't plan any accommodations, so I'm currently going to be driving ~an hour each way every day. No fun, but it'll be worth it. Maybe I can find someone else from the Central MA area to carpool with...