google make update everyday for pagerank my site on 2 month from pr6 drop to p3 , yesterday back to pr6, google is google, www.directorypm.com
There is no pr updation is going on from the side of Google, there may be another reason to drop your pr from 3 to 0. You have just 15 pages indexed in Google and your site is showing only 1 backward link for your site, then how can you accept pr 3 from the google only behalf so less link popularity. I think your should get some quality, theme base and relevant back links for your site, if you want good pr in next pr updation when it would be happened.