From an interview with Matt Wells of Gigablast:
“Another major feature of Gigablast is its ability to index Web pages almost instantly, Wells explains. The network machines give priority to query traffic, but when they’re not answering questions, they spend their time spidering the Web.”
The more things change, the more they stay the same.
His comments on the reasons for Google’s success are dead accurate, by the by. PageRank was not as important as size and freshness.