DeusExMachina already gave you a good review of the busyness and first impressions of the app, so I won't revisit those. Instead I'm going to offer some critique of your website.
First, on the app store you have both the links for your company and for app support pointing at your company home page. If I'm looking for support on your product, I don't want to have to wade through your entire site looking for help. The support link should go directly to a page where the app is the main feature and the focus of the page is support.
Your home page looks a little cluttered too. I'm not sure what the "So nice to meet you" graphic and the picture of the masked stuntman is supposed to communicate. Since you only have the single app right now, it should be featured more prominently, like the first thing on the page. I see it at the bottom there, but the other stuff detracts from it.
I notice that you have a manual for your app featured on the home page, but I honestly missed it while looking originally. It doesn't stand out at all. It should be a nice big button and featured prominently with the actual information about your app, and also on your support page.
Speaking of support, you should not link directly to the pdf manual from the support link in your menu. Some people will get pissed when acrobat fires up and takes over their browser unexpectedly. I thought the link was broken and then realized I had downloaded 8 copies of the pdf in the background.
Some remarks about your "Latest News" feature on the home page. Two of them are dated for November 2009, and the last one is undated. This makes it seem like the app is a little stagnant. Also, what's the point of having links on the items if they're all going to redirect to the products page?
I would update your latest news any time you add a new version, feature, get mentioned online, whatever. Anything to make it seem current. And if you're going to link, actually link to something related to the post. "Jobshare 1.0.1 What's new in this version" didn't tell me what was new in that version.
I'm not trying to be mean, but your app site is one of the most important marketing tools that you can use.