There are a lot of black hat techniques that should be in that list.
12. Hiding text by giving it the same color as the background, or covering it with another element.
13. Excessive use of keywords or keyphrases in the sites content. (5% - 6% saturation shouldn't be exceeded)
14. Splash pages
15. Content that doesn't match the meta information.
Some other regular mistakes:
16. Misuse of tags (such as using heading tags to bold text)
17. Use of images in place of text. This is okay in moderation.
18. Excessive outbound links. It won't get you penalized, but it doesn't help either.
19. Not using alt, title, or longdesc attributes in img tags
There is bound to be hundreds of these types of mistakes. That's all I could come up with for now. Anyone else want to add to the list?
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