Hi niico,

This looks a lot like https://www.strongcoin.com but with a dashboard. I will probably add this kind of functionality too. (I own strongcoin)

But to build your app, I recommend you take the code for http://carbonwallet.com which is already available on github and submit a pull request for a dashboard like you have in your post.

CarbonWallet is already available as a chrome application, and the logic is tried and tested.