Any iPhone/Touch owners here? If so you'll be able to get the free BA App later today when the 2.0 software launches.
It looks like it'll just give you quick access to timetables and arrivals/departures. Hopefully they'll get some kind of booking integration in future.
I found it on the iTunes store. But it should all be live later today!
Here's a screenshot showing the features here:
http://i33.tinypic.com/mwczh1.jpg