No macros, no plugins, no extensibility, no embeddability or automation (a la COM/OLE and VBA for Excel).

Excel's position in companies that give Microsoft tons of money for copies of Office is still far from threatened.

But for the local girl scout troop deciding which neighborhoods to sell cookies in and who sold how much when, this seems, like, superduper.

Oh my god! RUN!

Seriously, that's quite cool.