I also like the resources at 960 Grid System. They have layouts for both 12-column and 16-column grids.
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I'm Marcy Díaz, the owner of Amethyst Website Design, a small business located in Phoenix, Arizona (in Ahwatukee Foothills). I help people, like you, grow your business with an affordable WordPress website design. Sign up for my blog and website tips that help you manage your own website.