Blogrank -- Big Why?

I'm number 58 today on the Daypop Blog Rank, but I have NO idea why. There are other days where I have 10X the traffic and hits and I don't rank as high, if at all.

Also was listed last week as one of the Daypop Top 40 on a day that I had minimal traffic. If it has something to do with number of links, someone please clue me in.