What intrigues me most in the Google error message is the references to IndyRank and to PageRank possibly being a vector. In regards to IndyRank, Stuart Brown suspects  it means an ‘independent ranking’ — a “human-derived page ranking scoring, independent of the concrete world of linking and keywords”.
In regards to a PageRank vector, Wesley hypothesizes:
“If page rank is actually a vector (multiple numbers) as opposed to a scalar (single number) like everyone assumes (and like is displayed by the toolbar). It would make sense — the page rank for a page could store other aspects of the page, like how likely it is to be spam, in addition to an idea of how linked-to the page is. The page rank you see in the google toolbar would be some scalar function of the page rank vector.”
Of course the Google engineers are probably laughing at all this.