As far as I know PigeonRank [google.com] is still alive and well. (Actually not all the same pigeons; there are replacements from time to time.)
It's my understanding that after the Google engineers got frustrated with the problems inherent in cloud computing they decided to drastically increase the number of Pigeon Clusters. The new Caffeine infrastructure is the result.
And now it's time to grab a book, this morning's leftover bagel and go around to the park to try to increase some of my sites' PR.