Google has updated TBPR more than 3 times in 2011. Today I noticed some TBPR fluctuation. I reckon it happened just after 11am this morning. Although TBPR is not important, most SEOs do take it into account in one way or another.
I think Google is playing a very clever game by updating it TB PageRank so many times in a year. I have always thought PageRank is a tool for misinformation. More on this in a couple of days.