Yesterday, I started to notice that my Google traffic for this particular site has come back to its normal level (maybe a little less then normal) from about 3 or 4 weeks ago. But I am not the only one who noticed this, folks over at WebmasterWorld have a 8 page thread (within 26 hours since its creation date) named Major changes in google update..starting?. In addition, there is a five page thread at SEO Chat and eight pages at Digital Point - keep in mind, different forums show different number of posts per page.
Its interesting because some speculate that Google is now assigning less weight to links. It is hard to know for sure at this time, let's keep watching.
A great tool to compare data center results is over at McDar's Google DataCenter Watch Page.