This site has a nice feel to it. It has a simple layout with plenty of space and a restrained color palette. The font choice (Helvetica Rounded) is suited particularly well to the subject matter. Along with the cloud graphic, it’s very soft and almost tactile (like a cloud?)
But while it’s clear they do something in regards to mobile development, the main headline is a bit confusing in that I’m not sure off the bat if this is something for developers or whether they are developers. It turns out it’s the latter. I would suggest perhaps changing the word ‘developers’ to ‘development’. Doing that might clear it right up.
I also find it a bit odd how the site actually functions. It doesn’t appear to be a side-scroller at first glance, but it is. And since a user might be just as likely to scroll down as they would be to click a link in the navigation, it’s important to take that into account since what happens if you click on a link is that it horizontally scrolls without taking the user back the top of the page. Which means it might scroll to the bottom of a page you’ve never been on, which is a bit confusing.
All in all those issues are minor in a site that is very well laid out and attractive.