Due Diligence Checklist for Buying a Website - help me create it

I wanted to create a list of all the things to check when buying a site and put it together as a collaborative list.

I'll start - in no particular order:

1. Using http://tools.seobook.com/firefox/seo-for-firefox.html do a quick check on the site stats:
Attachment 87

2. Check traffic for the sites keyword/keywords:
https://adwords.google.com/select/KeywordToolExternal

Make sure to click "Exact Match" when viewing the results

3. Check www.spyonweb.com to see other sites listed on the same IP and with the same adsense code

4. Check whois - private or open? Matching email? Real name or fake? Real address or fake? US based or Nigeria? Working telephone number?

5. Check compete.com for traffic information/keywords (not accurate but may give "ball park" = better than nothing).

6. www.quantcast.com for more traffic estimations

7.www.semrush.com for keyword ranking data, traffic estimation, competitors (personal favorite)

8. http://www.linkdiagnosis.com for a look at back links, PR of links, nofollow/dofollow

9. Check backlinks in yahoo (example): http://search.yahoo.com/search?p=lin...d-people.co.uk

10. Check www.copyscape.com for duplicate content

11. DMOZ listed or not? http://www.google.com/search?q=%22ex...&cat=gwd%2FTop

12. Yahoo directory listing or not? http://search.yahoo.com/search/dir?h...d-people.co.uk

13. Check Google Page Rank - does it have page rank? Is it indexed?

14. Check www.archive.org - has the site changed recently?

15. Check google cache date... is it cached? Is it in google? How long ago was site cached?
http://webcache.googleusercontent.co...uk&btnG=Search

16. Search google, yahoo, bing for references of "www.websitename.com" and "websitename.com"



Allright guys - try to number them if you can. If you want to add to what someone has said please number your comment (so we know what point your comment is in reference to) so we can create a "master list" of all the due diligence stuff to check.