Dan Bricklin (one of the guys behind VisiCalc, the original spreadsheet software application) is working on a web based application called WikiCalc that will offer the collaborative features of a wiki in the guise of an online spreadsheet. WikiCalc is in the alpha stage of development now, but based on the screenshots I’ve seen it looks very promising. Perhaps more importantly from a user adoption standpoint, WikiCalc is being developed in Perl and will be released under a GPL license so it should be freely available to run on all major platforms once it’s ready to go. Needless to say I’m very excited about this application and I anticipate a lot of other people will be as well.