pageranks change all the time.  For many domains that have been expired, google will “unrank” the domain name (for others it stays).  So when you find one on drophunt, make sure to double check it by going to the domain summary view (click on the domain name) and click through to the pagerank checker to doublecheck.

I really dont have the bandwidth to check these domains in realtime  (we have over 5M domain names) so I can only do it once.  After that, google might change their mind . . . so make sure to double check!