GLSL

Hey so I know this question isn’t really openGL, but I was wondering if you guys have any GLSL tuts/tips/tricks/resources/books that you find useful. Stuff that goes from the basics to advanced topics.

I’ve looked a little in the past, but I’m starting to think that my GLSL needs a lot more work. I’ll be taking a look around and posting what I find in here, but if you have any in the interim that would be awesome.