There appears to be some activity with Google Page Rank, reports Whims and Wonders blog, which noticed some fluctuations in the last day or so.

Update: Matt Cutts finally sheds some light on what’s going on:

Okay, back on topic. The data for externally visible PageRank didn’t change. The only way someone would notice their PageRank changing last week is for example if they were checking for a different canonical url (e.g. externally visible PageRank is shown for www.example.com, but Google changes the canonicalization from www.example.com to example.com).