Alex997 - 4:29 pm on Aug 2, 2012 (gmt 0)
Latest new page I have with a pagerank is from 26th July. NONE of my existing pages already with PR displayed have changed though.
Still 1/3 more googlebot activity on my site though since about the 19th July (guess at exact date as cannot see enough detail in webmaster tools graph). No major changes or significant additional content in this time - so just Google having increased interest in my site for some reason.