We've just released our DiaCon Alley app at
http://www.diacon-alley.co.uk/app/ !
It has the full programme of events for the con and should work with most smartphones, tablets and laptops. And for those of you who won't have any internet, it even works offline! Just visit the app once when you do have an internet connection and it will automatically save it and load the next time you visit, even if you've got no signal.
If you have an iPhone you can add it to your home screen by tapping the button in the middle of the bottom menu bar in Safari and then selecting "Add to Home Screen".