Robert_Charlton - 5:47 pm on Jul 31, 2012 (gmt 0)

I think all of these changes are query specific... and in general I wouldn't worry about it.

I have on one occasion, though, in an ecommerce site, noindexed a page that was essentially a customer TOS page, not something intended as a "sales" page. Google had rewritten the title and given it a sitelink (I'm sure as a test) which made the page attractive, and I felt that any searchers clicking would back out of it and perhaps hurt the site as a whole.