Rayner, Foorman, Perfetti, Pesetsky and Seidenberg, How Psychological Science Informs the Teaching of Reading Psychological Science in the Public Interest Vol 2 No 2, Nov 2001 (the longer (44 page) study on which the Scientific American article is based)
The UK Literacy Trust links page for phonics, including discussion of the difference between analytic and synthetic phonics, and the Clackmannanshire programme.
Reading Reform Foundation UK organisation; very pro synthetic phonics; useful links page.
Jolly Phonics. A successful British program that has been running for some time, with nice books (Jolly Finger Books) with cut out letters that young children can run their fingers around.
Ruth Miskin (Read Write). Another British site selling a synthetic phonics programme, which has some useful resources; from this page you can download a powerpoint document that gives you the phonic sounds of (British) English
Here are a few links that might be useful
Articles and Other Online Resources
Rayner, Foorman, Perfetti, Pesetsky and Seidenberg, How Should Reading Be Taught? Scientific American, March 2002
Some Commercial Sites Selling Synthetic Phonics Materials
Read America This is the organization run by the family of Diane McGuiness, who is the somewhat strident author of Why Our Children Can't Read (very good in general, though almost certainly wrong about dyslexia), and a couple of recent MIT Press books, Language Development and Learning to Read and Early Reading Instruction.