If you’ll be in Las Vegas for LDI you should make sure you grab the LDI 2010 app for your iPhone.
From the Apple App Store description:
> Navigate like a pro with our interactive maps, search the exhibitor directory, or create your show schedule by choosing sessions you want to attend and speakers you want to hear. Enjoy the show!
You can create appointments, browse by exhibitor, and zip around the show floor map with your finger. Neat.
Looks like there’s also a version available for Android phones, but we haven’t tried it.