resources:

materials for (in)visible pins:
•LEDs
You can buy LEDs from many sources, including your local Radio Shack. If you are buying infrared LEDs in bulk, you can save money by purchasing from LEDS4less.com. Also, you can save money by ordering from China through hebeiltd.com.

•Conductive thread
I use 117/17 x 2ply silverized thread from Fine Silver products (fine-silver-productsnet.com). This is a large, industrial-size spool that conducts well but is a bit tricky to use in a sewing machine. It has a resistance of about 25 ohms/inch. Lame Lifesaver (members.shaw.ca/ubik/thread/order.html) sells a good, conductive thread on the traditional-size spool, but does not always have the product in stock.

•Batteries + Battery-holders
For cheap 3v batteries, try cheapbatteries.com. The battery holders I found most useful are "small pad pattern" one and two cell battery holders from electronic suppliers like Keystone Electronics (keyelco.com) or Digi-key (digikey.com). The part number is 1061 for the one cell and 1062 for the two cell holders.

•Felt and Fabrics
I used felt for all of my patches because it is cheap and easy to sew both in the machine and by hand. For the backside, I usually used a stiffened felt called Eazy felt available at Michael's or online at S&S. There are also conductive fabrics that are available through LessEMF.com.

surveillance studies:
•NYCLU, "Who's Watching"
nyclu.org/surveillancecams

•Project for Public Space, "Safety + Security in Public Space"
pps.org/info/placemakingtools/issuepapers/safety_security

•IAA, "iSee and The Myth of Privacy vs. Security"
appliedautonomy.com/documents.html#ISEE

•Preemptive Media (Beatriz da Costa, Jamie Schulte and Brooke Singer), "Surveillance Creep! New Manifestations of Data Surveillance at the Beginning of the Twenty-First Century"
http://rhr.dukejournals.org/content/vol2006/issue95/#FEATURES

other camera surveillance projects:
•The Surveillance Camera Players
notbored.org/the-scp.html

•IAA's "iSee"
appliedautonomy.com/isee.html

•Jill Magid's "System Azure"
systemazure.com

other LED Do-it-Yourself projects:
•LED Wearable Shirt
cs.colorado.edu/%7Ebuechley/diy/diy_tank.html

•LED Throwies
graffitiresearchlab.com/?page_id=6

•LED Fridge Magnets
instructables.com/id/E3E2J693CFEP286SRD

electronics basics:
•Electronics Club
http://www.kpsec.freeuk.com

•Soft Sensing
http://itp.nyu.edu/physcomp/sensors/Reports/SoftSensing