How does Google determine what's relevant?

[Linkster]

eman - there actually is an explanation for what you saw and exactly how that "see the omitted results" works

First - the reason that you saw the issue with the pages low count - they are currently redoing the entire database with a refresh that is taking a little longer than normal - and it hasnt totally propagated throughout their datacenters - so results are a little off right now

Second - the ommitted results command works like this:
When they show results for a search they only allow two results from the same page(URL) - that has been part of their algo forever - when you "click to see the ommitted results" it adds in the rest of the pages from that site - the way it does it is in the URL when you click to see the ommitted results is they add &filter=0 to the url which turns off the dupe filter (normally if they are not in an update)