Last week Google again smoothly made a pagerank update of all the websites.

http://techunknown.com got lucky this time. In just 5 months, that without much effort we got PR1.

I found one more useful website to check the pagerank of your websites in bulk at once @ http://checkbulkpagerank.com/

Regarding how exactly the pagerank algorithm of Google works, i found some pretty interesting images. Do have a look: