Here are a few links to Jane Fulton Suri's Thoughtless Acts initiative at IDEO…

Website:
http://www.thoughtlessacts.com

Flickr Pool:
http://www.flickr.com/groups/thoughtlessacts/

The essay in the book is here:
http://hci.stanford.edu/dschool/resources/needfinding/fulton_suri_thoughtless_acts.pdf