Very nice. I did a day project a while ago to do something basic. http://www.binarymax.com/cube.html (NOTE: doesnt work in firefox, but is fine in all other browsers).

I'm pretty sure my algorithms would quickly run into stack and memory issues quite quickly, but I havent looked at it in 6 months.

How long have you been studying OLAP structures and algorithms? Its the kind of stuff that is very interesting, but I sometimes have trouble wrapping my head around. I'm curious if you have any favorite reading materials on the subject?

EDIT: also FYI, your link on the blog to the github js repo goes 404 since it has an extra '.' on the end