Looks like the toolbar PR updated today, with many sites losing lots of green. Problogger alerted me to it, since it noted that its PR went down to a 4, as did Copyblogger's. Some of my sites saw a lower PR, including this one. However, I've still got great rankings and traffic for things I track, so there's no direct reflection there. If PageRank falls, but rankings and traffic stay the same, does anyone hear it drop?
I don't really pay attention to other sites' PageRank, so it's hard for me to tell who droppped and who didn't, so if you know of any big names out there, pass them along. I did note that seroundtable dropped from a 6 to a 4.