Today I visited Raglan Castle in Monmouthshire with my family. Cadw, the government body that manages the castle, were running a trial to deliver audio files to visitors' mobile phones using Bluetooth. As I walked through the entrance I simply made my phone discoverable, waited a few seconds for the MP3 to download, then started listening to a guided tour of the castle. It's a great use of the technology: it just worked.

The talk only lasted a few minutes, so we had plenty of time afterwards to run around the ruins.

A couple of technical questions that sprang to mind:
  1. How would you set up a server to push files over Bluetooth? (There are loads of ways you could use this - maps of the local area at transport hubs, sharing the schedule at conferences, random photo of the day at home, etc.)
  2. Can you make audio files navigable? That is, make it easy to go to the part of audio file that is about a given exhibit by typing in the exhibit's number? (This problem reminds me of Cliff Schmidt's talk about the Talking Book Device at ApacheCon EU 2008.)