There are a lot of reviewers here asking, "What makes this product different from ____?", which requires that you follow up to explain (in quite a few words) what makes this product different/better than your competitors. To me, this is bad, because your potential customers are probably going to wonder the same thing. If you're going to sell this thing, you need to make it clear to your potential customers exactly what your product is and what makes it great within seconds of them hitting your homepage.

In your case, I would think that the very least you will need to do is make your product look at least equally impressive to something like Campfire right off the bat (which will necessitate having a very well thought out, professionally designed homepage) that rivals what 37Signals has, so that people are at least intrigued enough to dig further to see what your product really has to offer.

I'm going to echo comments that have already been made about the site itself. I find the design bland and dreary. There also isn't much information on the site at all. What happens if I don't watch the video? I have no idea what the product is about or even looks like.