I have read parts of this post over many days and can’t remember all of it (bad memory) 
Here are my thoughts on the matter:
1. Black Hat SEO – Unethical Practices
Using the work of others to gain a foothold in the search engines including:
a. Stealing of Content – I HATE THIS WITH A PASSION
b. Google Bowling or using any other method to destroy another person’s hard work
c. Spamming forums, guest books, tagging, trackback, or any other form of link dropping in order to gain in the search engines
d. Spamming email accounts using harvested emails
e. Using automated software to link, spam, harvest, steal.
f. Scraping Search Engine SERPS and auto-creating sites. (Still Stealing)
g. Using RSS Feeds without the embedded links or giving the credit to the originating site
h. Using MySpace, Friendster, or any other social arena by auto-creating friendlists (spamming) and then spamming those ‘friends’
2. Grey Hat SEO – Manipulative of SE’s, but not unethical
a. Blog and Ping – Pinging Blogs to let the search engines know that a page has been updated (This can and has been abused)
b. Link Exchange – This is not seen as acceptable to Google and other SE’s, but we all do it.
c. Cloaking of content to improve keywords while showing the user a more salesy page (done by many large companies to improve the SERPS for graphical pages)
d. Submittal (auto or manual) to Digg, Twit This, FeedBurner, Rojo, etc (done on my blogs and forums, also done here at CAP and many other places)
e. Using Social Networks to ‘Add A Link’ to your website. This is mainly social bookmarking (can be abused)
Sorry for the long post, but I hadn’t weighed in on this yet Had drive issues and have been working feverishly to gain access to my websites, affiliate accounts, and financials.
Hope that is a good list… I’m sure some will agree and many will disagree – but that is why there is so much controversy!