Anything that makes it more user friendly (and secure by default) could get you a lot of customers. A lot of people are interested in it due to the recent media

Anything that makes it more user friendly (and secure by default) could get you a lot of customers. A lot of people are interested in it due to the recent media hype but don't get the technical stuff. Apart from that, as the bitcoin economy is still in its very early stages, everything that looks more professional and trustworthy than a cobbled-together PHP script on a dirt-slow server could become a huge success.