The Next Google PR update will start to updating by End of July - Beginning of August 2007 .

I have collected a few tools to check pagerank in various ways, various data centers. Please do note that different tools listed use different datacenters so the result may vary and I suggest you check once in google toolbar . It is normal that it shows different pagerank in different datacenters, In the past it’s usually lasted a few days and then they all gave out the same PR.

PageRank Check
http://www.sr-ultimate.com/pagerank
Ae4r.com Pagerank Checker (AJAX) - Alexa+Google,Yahoo backlinks+DMOZ lookup)
http://www.seologs.com/pr-check/pagerank-dc.html
http://www.seochat.com/seo-tools/pagerank-lookup/
Various Datacanter
http://www.mcdar.net/Q-Check/datatool.asp
http://www.iwebtool.com/pagerank_checker

Google PR Update takes place roughly every 3 months. Estimated date of last update: End of April - Beginning of May 2007