Most of the stuff here is not new but it’s good to have an up to date list. It doesn’t mean the things below don’t work however. This is what I took from it.
Bad signals
Hidden text
Hidden links
Sneaky redirects
Javascript cloaking
100% Frame
Keyword stuffing – page text
Keyword stuffing – URL with dashes
Sites with PPC only to make money – MFA sites
Scraper sites
Doorway pages – Doorways for locations etc
Images that are served off other sites
Parked/Expired domains with sponsored links/no original content
Good signals
Original reviews
Comparing prices
Physical address
Working comment box
Returns policy with physical address
Wish list link
Working user forum
Other points
Blogs and forums that have lots of spam comments are not penalised
Pages existing only to make money are spam
Spam judgement summary
Does the page provide good user experience?
Does the page contain original and helpful content?
Is the page designed for users?
