The NO2ID "I will refuse to register for an ID Card" pledge seems to be going well with over 500 people signed up already today.
A feature which is not obvious until you actually get onto the pledgebank website is that you can also sign the pledge via a mobile phone SMS message short code.
Text pledge refuse to 60022
(standard rate SMS charges)
You can also print out some posters and flyers publicising the NO2ID pledge.