norton_j_radstock - 7:14 am on Jan 23, 2011 (gmt 0)

Whilst outwardly looking normal, the obvious factor (to human readers) is bland low value text that really adds nothing new -its sole purpose is to catch search engines, and as such it is likely to have have an excessively high number of related keywords.

I would have thought that a strong indicator is a low proportion of outbound links other than adverts.