Those lovely folks at Adaptive Lab invited me to give a short talk last month at their inaugural Pi People event over in Old Street.
I talked about why there are so many different card decks around at the moment (culturally, creatively strategically etc), and what's going on when we use cards to create ideas that work on the web - here's the video they've made of the talk:
The second Pi People event is coming up very soon too, which you should totally get yourselves along to - more details here.