I came across this sometime in the last year, I think. 

Its a theory put forward by a Stanford guy, Muthu Alagappan, on how there are actually 13 positions in basketball, not the traditional 5.

I liked it then, and now its getting picked up in wider circles as well.

These are his 13 positions:

If you want to check out his entire talk as well as the presentation, go here From 5 to 13: Redefining the positions in Basketball