I took a crack at estimating PlayBook sales about a month ago, but with RIM set to release sales number tomorrow, I figured that I would take one more guess to see how accurate any of my estimating actually is.
As of yesterday I am estimating that RIM has sold between 258,000 and 800,000 PlayBooks. My best guess is that they have sold 429,000 tablets, which is very close the the analyst guess.
This estimate is based on a lot of assumptions, and guess work but is based on the number of downloads of the free game Pixelated. However, as Pixelated has remained one of the top 10 most popular applications on the PlayBook, I feel that I have better numbers then most people to base this guess on.