Welcome to WebmasterWorld Guest from 22.214.171.124
No 1 Doorway/Duplicate pages
No 2 Doorway/Duplicate Pages
No 3 Doorway/Duplicate Pages
No 4 On topic result
No 5 Doorway/Duplicate pages
No 6 Doorway/Duplicate pages
No 7 Local Business Directory - on topic
No 8 Local University - on topic
No 9 Doorway/Duplicate pages
No 10 Local Directory - on topic
The only changes I have witnessed over the last 5 years are the same companies switching places in the top 20 results.
Techniques including multiple cross linking and invisible 1x1 pixel links predominate.
IMO this is something they can never gain control over without human intervention.