very interesting findings there.
i too would be very interested in payWave on my mobile - the Krispy Kreme doughnut hut (at London Euston) had the facility when I was there last month
With my old XDA Exec I had a photo of my Tesco clubcard on the device and would get the lady to scan the screen - worked about 9 times out of 10 (only failed a few times when they insisted on putting it through the scanner, rather than me!).
But I haven't put it onto my Kaiser (Clubcard is now on the keyring), but I'll have to try that again.
If I remember correctly, the payWave system was only for small amounts of cash (I'm guessing less than £50) - so if you imagine this on your mobile, coupled with the Oyster, you would be able to get the morning papers with a sandwhich (and of course a doughnut!

) and pay for your tube fares too.
2 years time...?