I can’t say I was too surprised. Search Engine Journal was not the only site I noticed a drop in PageRank on last night, I noticed many other blogs and forums I read experiencing a drop. And recent Google activity has pointed to a new regrouping of PageRank, which may be addressing the size and growth of the Internet since Larry PageRank was first published, or may be addressing the growth of paid linking.
Pagerank drops and rises mean very little if anything at all. Even to the search engine, I am not sure PR has ant real significance.
To me, the green PR bar is a visual tool similar to a baby's soother, It is an illusion that both calms and confuses the masses of Internet marketers who want to believe that their web pages have some importance.
I remember when Google first rolled out PR. It worked amazingly, for about a week. From that point on, Pagerank technology became a "pot of gold" (literally).
Keep building quality backlinks as the net growth every day. This means if you stop working your pr will decrease naturally.
What about your traffic? This is what it's important.
I have sites with pr 0 that are on the first page of google ... so ...