bokEck,

Thanks for your suggestion (and your nice comments :-o )

I think you make a good point about the single-tap behaviour. We would like to cater for people with different requirements, so I think that adding a preference would be a good idea. How about this:

"Single Tap Behaviour" - Action taken when single tapping on a card:
o  Auto move card to it's destination (default), OR
o  Tap once to select a card, tap again to choose destination

Tapping on the table background will cancel a selection in progress.
In all cases, you can manually drag a card to it's destination if you wish.

How does that sound?

ps Sorry it's taken me a few days to reply, I've been on holiday in Malaysia :-)