3. Thou shalt Load Fast
Each and every page on your site should weigh in under 30-60KB total, including graphics and navigation.
If your pages must be larger, such as the case with long, 1-page sales letters, make sure the top part of the page loads fast so surfers can read your headline and introduction while the rest of your sales letter loads further down and out of site.
4. Thou shalt not use False Code
5. Thou shalt respect the Search Engines
If you want search engine traffic, use whole web pages that don't incorporate frames. Search engines get confused trying to read content from most frames pages because the designers don't set them up with the proper information in the correct frame.