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With this iteration, our search results may show:
Up to four web results from each domain (i.e., several domains may have multiple results) Single-line snippets for the additional results, to keep them compact
As before, we still provide links to results from a variety of domains to ensure people find a diverse set of sources relevant to their searches. However, when our algorithms predict pages from a particular site are likely to be most relevant, it makes sense to provide additional direct links in our search results.
in particular that the choice of additional pages seems to be rotating over time.
I have to admit that we did not expect is that #2 will straight away be replaced with another page from competitor's site.
More change for changes sake.
Once google decided to give a site multiple listings, another site cannot replace any position in those listings
Since one page from a site will immediately be replaced by a different page from the same site, can we interpret this as meaning that SITE AUTHORITY (as opposed to individual page rank for internal pages) might play an increasing role in the SERPs display?
Indyrank if by helping them you mean forcing us to use more adwords I agree
because 50% of all large b2b sales are offline anyway if not more
Another way I sometimes analyze a site is to do the search [site:example.com keyword]. That number seems to have a good correlation with authority on a given topic. I'll bet it helps a site get multiple listings, too.