Yes, we have - especially when it comes to the definition of PageRank. However, several Google folk have talked about there being more domain-wide factors being integrated into their algo recently. The details are pretty much in the area of "secret sauce", but if they say they have done it, I'm sure that they have - and trust would be one obvious area.
Authority is possibly another. I've been trying to outrank one particular page on a subdomain for several years, and the only reason I can see for its dominance are authority factors related to the domain itself, not even the subdomain.