Web 2.0 opportunity

Here’s another Web 2.0 opportunity for someone out there: We’ve got an online word processor (several, actually), like Writely, and a ton of other online productivity software.

Well, I want an online spreadsheet. Betsy and I are trying to do a budget for some things we’re interested in doing this spring, and having one online would be SO much easier. We could both update, etc.

Anyone know of the sort of thing I’m looking for?