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Here are a couple of grid templates for InDesign (around 450kb each). They are only for 8.5 x 11 inch pages and clearly for print layout, but you could use these as a starting point for developing a web-based grid system as well. Just change the units and increments to your needs and design it [...]

For anyone interested in learning more about developing grid systems, whether it be for print or web, Mark Boulton has a very good tutorial that discusses it quite well. It starts with the basics of grid systems and different ratios, and goes all the way through the development of fixed and floating widths on a [...]