Robert_Charlton - 9:09 am on Nov 21, 2010 (gmt 0)
I've just seen a variation I've not seen before. For a single word search... on page one, just one result from a site, and then on page two I'm seeing two adjacent results from the same site plus an expansion (+) link for more results (ie, pages) from the site. Yesterday, the same three results were 1,2, & 3 on page one.
Other multiple results from the same site for several two word searches are the same today as yesterday.
The shift I'd noted earlier for this site could be interpreted as switching between an informational page and a marketing page.