As I mentioned a few minutes ago in my story about Google’s new manual spam action viewer – Google has documented all of the manual actions a site may receive for spamming their search results.

Here are the eleven documents from Google on these manual spam actions:
Manual Actions
Cloaking and/or sneaky redirects
Hacked site
Hidden text and/or keyword stuffing
Pure spam
Spammy freehosts
Thin content with little or no added value
Unnatural links from your site
Unnatural links to your site
Unnatural links to your site—impacts links
User-generated spam

With that, Google produced a total of nine videos, I believe only seven being new videos, on these manual actions.

Here are all nine videos:

Does Google take manual action on webspam?

Cloaking:

Hidden text and/or keyword stuffing:

Pure spam:

Thin content with little or no added value:

Unnatural links from your site:

Unnatural Links to site:

Unnatural Links to site – impacts links:

User-generated spam:

Every SEO should make time to read all those documents above and watch all these videos.

Forum discussion at Google Webmaster Help.