Mockingbird is hardly the first online wire-framing tool.<p><a href="http://balsamiq.com/" rel="nofollow">http://balsamiq.com/</a><p><a href="http://iplotz.com/" rel="nofollow">http://iplotz.com/</a><p><a href="http://www.flairbuilder.com/" rel="nofollow">http://www.flairbuilder.com/</a>
Don't business plans serve a different purpose then mock-ups? Are you sure you can just switch one with the other and call it the same thing. A mock-up may be contained within a business plan, but a mock-up can't replace a business plan.
New Biz Idea? Forget Mockingbird, Use a Napkin Instead! But seriously there's no end to this. If you have a great idea, you need to put the pieces in place to not only develop & build the product but also to ship and monetize it.<p>I will say it is very simple to get caught up with a business plan and spend less time on communicating what the idea is in terms of what it takes to get it built. That's the easy way out and not the solution.