Here are a couple of Clear Files I picked up.
The book on the right is an adaptation of the original movie. The one on the left is an English translation (with footnotes!) of the original manga. Unfortunately the movie adaptation is a little bit naughty (you never catch Scarlett baring her breasts) so I'll focus mainly on the manga.
Finally, here is a picture of a Tachikoma. I came across this cutie at a pizzeria next door to I.G. Productions which showcases many posters, goods, and signatures of their artists.
I have other GitS goodies around, I'll try and locate them and show them off later.