It's interesting, but Alexa rankings for the lower numbered web sites strike me as being fairly easy to "game". If every member of this board got an Alexa toolbar, the Alexa rankings for the board would shoot up. I'm not sure the statistics are really meaningful.
For those folks interested in seeing Alexa rankings without installing their bloody toolbar, and using Firefox or Mozilla, you might consider installing the SearchStatus plugin. Quite useful, if I do say so myself.