[beat]

Drop me a line at the email in my profile... I'm really interested in how you go about this. I've thought about exactly this product, but stuck on the "If you have a hammer, every problem looks like a nail" effect, which is why businesses use horrid Excel for this duty in the first place. How do you get them to buy in? Your multi-platform approach might be the answer.

ps: Have you used any of 37signals' products? Look to them for UI simplicity. I think there's a real danger in adding too much functionality here.