Dan Bricklin's WikiCalc

This is so cool - the inventor of the spreadsheet is now testing a spreadsheet that runs in a Wiki program. This would allow you to create nicely formatted entries on webpages without having to know HTML.

I was tipped off to the program by a posting at ZDNet:

Bricklin's WikiCalc: Much much more than just a mashup of wikis and spreadsheets.

But, go to Dan's website to actually try it out.