I am working in Photoshop CS3 and would like to edit a photograph of mine to make it look like a Japanese woodblock print. This would probably involve creating a dark outline around the objects, and flattening planes to make them look more 2D. I'm also interested in trying to replicate the colours. Thanks!

There are 2 techniques you can probably use to do this.

The first technique is one that I found on this website. It has info on how to create some dark outlines.
http://www.illustratortips.com/index.php/Instruction/Advanced-Tips/sparkle-and-glow.html

The second technique is by replicating traditional filters. This site has some details.
http://www.askphotoshop.com/replicating-traditional-photography-filters/

Creating a realistic Japanese woodblock print out of a photo would be quite tough and requires a lot more work so I wish you all the best of luck!

~ Josh Tam
http://joshtam.net/world