As part of SA4QE2011, here's three photos of my drop locations (there were many more, but these were the ones I photographed). I'd also like to share this excellent image of the ephemera distributed by Twitter user @Dystopia2009 as part of his event:
Drop #1
Somewhere between Enfield Town and Seven Sisters.
Drop #2
The British Library Cafe.
Drop #3
Somewhere in the British Library.