It does seem to me, at least where I am employed, that most of the engineers that have been around awhile tend to use P.E. while most of the newer engineers use PE.
I think its just a personal preference though. I use PE.
I passed the April 2010 exam. If I remember correclty the site was down before the results were posted, but I don't remember what the error message said. I could be wrong though. It did take me a few days to return to earth after seeing my name pop up on the website.
Good luck to everyonethat is still waiting. I was in your shoes six months ago. It is an agonizing wait, but the feeling is that much better when you pass.