This is going to be detailed. My thoughts, in order, as I use your site. These comments are mostly negative, but I hope you can take them constructively. It's not a personal thing =) I'm trying to help you.

1. Name. Srsly?

2. Color scheme. Fix it.

3. Why should I use this? It creates a "business plan", but is it any better than the one I already made for my investors? As a user, I want to know that you can either

A) add pretty pictures / make up for my lack of design skills

B) Suggest things I might have forgotten, or otherwise improve what I could write in word / google docs

C) Add some sort of 'social' element to business planning (e.g. sending it to a list of people I manage, commenting, something like that)

Otherwise, I have no reason to use your product. You need to figure out what it is you are providing (i.e. value) and put it on the front page, where I can see it.

3a) Also, I want to see what the final result looks like. Sample business plans! Put the output formats in a bullet/feature list (PDF, hosted automagically, DOC, whatever it is you support, because i have no idea).

If I were a random user not reviewing your site, I would have left at this point.

5. Why do you need an e-mail? I didn't receive any "Thanks for signing up!" mail from you, so I'm assuming you're going to spam me with feature updates later?

6. What is a strapline, and why is it italicized?

7. I'm assuming the "Author" is me? Don't you already have my name? Didn't I type it in 10 seconds ago?

8. What is drstunner and why is it autofilled in every box?

9. Explanation text is a good idea. Some of it appears to be voiced awkwardly. Random example: Why are those things "drivers"? Minor grammatical issues. Yes, i am a grammar nazi.

10. Asterisks. So I'm expecting some type of markup?

11. This autofilled text is really annoying. At minimum it should clear when I click in the box. Worse is the complete lack of grammar--my subconscious concern is one of these could end up in my final plan.

12. I just realized that the stuff in the "Notes" green box has a section for each input field. You need to move that somewhere next to the input field I'm working with. Otherwise it's scroll-->type, scroll->type

13. The Financials section is way simplistic. Maybe I'm thinking about a subscription or advertising model, or maybe I charge for something that is sufficiently different than (or unrelated to) primary costs or users. Imagine if eBay, or Google, or Mint were using your site. I looked for a way to turn off this section (impossible) or use my own chart (also impossible).

14. Trying to use the "Plan" section on the right for navigation... it's not in any sort of order. I have no idea what section to go to 'next' in the flow. Wait, why is this a flow again? And why is the 'overview' the last stop?

15. Ah, so it generates PDFs. Twenty minutes later, I now know what your product does.

16. And those PDFs look like crap. Headings and normal text, aparrently. In landscape format. And advertisement for you on every page. Investors will be signing up in droves once they learn that I used "bzplnr".

17. The asterisks... are asterisks.

18. Clicking "generate..." again gives me "Matt Siegel's" business plan, which is certainly not me, generating FUD about trusting you with my secret plan.

You need to look hard at 3/3a, which is where most people will leave. What value are you providing? Right now, the only value is the somewhat-helpful text that I didn't realize was associated with input fields until halfway through. This app is one big form and you need to do some usability work here. Filling out forms isn't fun for anyone, but your task is to figure out a way to make it fun.

The finished PDFs look like crap (I can't even do bullet points). The lowest common denominator here is google docs-like markup. The real performance metric is Word templates. Until you at least support textile/markup/google docs styling, nobody's going to hand this PDF to an investor. And you're not really going to see users until you surpass word templates.