There is some good discussion starting in the forums with regard to including some statistics functionality in WordPress. I think this is a very useful idea that a lot of people would benefit from. Feel free to hop in the discussion if you have any ideas regarding this.
There have been some more improvements to the new calendar code, including tweaking the style a bit (hat tip: Dunstan) and integrating Alex’s tooltip code back in. There are probably going to be some more tweaks over the next day or so getting the code as fine-tuned and efficent as possible. After that’s done I’m going to look into taking it to the next step so a similar function could generate a calendar view similar in spirit and function to what Mark Pilgrim uses. If you have any ideas regarding this feel free to chime in on the forums.