I think the author is missing the point. Some data just looks and acts beautifully in tabular / spreadsheet form, and if you have an app where that is the case, then by all means, use a tabular layout.

Does that mean you are just remaking a spreadsheet? Cmon. No. There is all sorts of added value for using a webapp that has a tabular data view. Maybe it's nicer to use. Maybe it comes with choices pre-filled out for you for certain columns. Maybe you provide user/team visibility, or sharing, or all sorts of other stuff that a simple spreadsheet could never provide standalone.

The point is, don't shoot yourself in the foot because 37signals forgot to put a tabular view of their data in. That means nothing. You should be thinking -- does a tabular view add value to your app? Yes? Great, then provide a tabular view for your users.