Instacalc

just found a live, bite sized, embeddable spreadsheet-ish applet (here, i had to use the html version). The embedded applet is even user-adjustable. This looks pretty cool, specially if you're doing a back of the envelope calculation.
How many piano tuners live in Auckland? First order guesstimate might be:


a quick look at the nz yellow pages for piano tuners in auckland gives 19 - not bad!