I like the idea and the design is very good.
I think the landing page could do with an overhaul. The main issue is it's not immediately obvious what the product does. What exactly is "mobile file management", "content management" and "content distribution"? HN users could tell you, and if they didn't know they could probably make an educated guess but what about the office manager who currently uses email to share files?
To be fair, further down the page you have this:
"Zigzag Cloud is an easy to use Mobile File Management (MFM) System for business. Sync your documents, meeting notes, training material, or sales presentations to your team's iOS devices over the air without"
I think it could be simplified and moved to the top of the page. Something like:
"Zigzag cloud lets you share presentations, spreadsheets and other files with your team using ipad and iphone (coming soon)".
It would also be interesting to A/B test the wording, design and placement of the download button. I think you'd see more downloads if you ditched the 'learn more' button (make it a prominent link on another part of the page instead) and if you removed the popup for the download button - you've already told the user it's an iOS app and that only the iPad version is currently available. There's no need to repeat that info. I'd be tempted to try something simpler like "Download from iTunes".