DDR2 - Freescale App Note 4215

MX28 Layout and Design Guidelines.

This application note has excellent advice for DDR2 designs.

Freescale DDR2 - AN4215.pdf

Right the First Time - Lee Ritchey

Right the first is an excellent PCB Design resource authored by Lee Ritchey.

Lee has made this book available for free download: Right the First Time:

PCB Magazines Online

PCB 007

Printed Circuit Design & Fab Magazine Online

Designing PCB Stackups

Harry Ott Consultants

Part 1 PCB Design - Nov 2012 Lee Ritchey: See page 12
Part 2 PCB Design - Dec 2012 Lee Ritchey: See page 36

Printed Circuit Design & Fab Mag  2009 - DR. ABE (ABBAS) RIAZI

Freescale 4 Layer and 6 Layer AN4215.pdf

Low Risk Digital High-speed 8 Layer Stackup - Barry Olney

Free DFM - Advanced Circuits

Advanced Circuits offers a Free DFM check for your designs.

I recently used Advanced Circuits for a quick turn and I was very happy with the service and results.