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If you stay away from using tricky stuff just to show off, use external js, external css, and a strict doctype, you'll be able to get some very high text-to-code ratios. I've got some meaty content pages that are probably near 90%, but even on short pages you can get 35% or better.
If you're looking for search engine success, the more an non-techie can read your source code and make sense of it, the better off I think you are.