Here's an interesting post to the Syndic8 List.

Google spiders RSS.xml files that I publish with a personal Radio Userland
weblog.

Google's pingback crawler visits all of my newly published pages when they
contain titles synonymous with purchased Google Adwords.

regards

Bernard Goldbach
The Irish Examiner

Does this suggest that one way of ensuring good returns on Google might be to check for related Adwords and ensure that those which have already been assigned are included in your page titles and content? How far could webmasters go in this without undermining the reliability of Google itself?