Crazy about grids: design art and the web! here are some great sites about using grids in web design 

www.fireworksguruforum.com

Mark Boulton - Why use a grid?
5 simple steps to designing grid systems
Khoi Vinn & Mark Boulton: Grids are good
Developing the grids that support your design: emanuelblagonic
Gridding the 960: Cameron moll
Smashing Mag - designing with grid based approach - lots of additional links here
Beautiful sites with little or no images - you can see the beauty in using grid layouts here - aesthetically pleasing sites, with very little in them, but due to layout with grid system, they do the business!

http://mezzoblue.com/archives/2005/05/13/columns_gr

design inspiration and more

http://devkick.com/blog/design-inspiration-european-graphic-design-from-1950-1970