Robert_Charlton - 8:22 am on Sep 26, 2010 (gmt 0)
In the past, where I've seen changed titles displayed in the serps, the page returned was always appropriate to the query, and the title change didn't affect the rankings. It might reflect them, but it didn't change them.
As I understand it, in the past a title change was in fact done as an "overlay" (that's the word I've heard used by search engineers to describe it), after the rankings were determined... much as a snippet is returned or as highlighting is added, when the results page is returned.
So, I'm very skeptical that this would be "changing the rankings for a lot of websites all over the web", and I don't want to start any rumors. How do we know that rankings are being changed?
vivalasvegas... what are you seeing on your page? Sounds to me like the rankings in question are being driven by the inbound internal link, which is then also affecting the title returned.