Microsoft's Marketplace is hoping to be a big contender to the iPhones app store. What's the first thing you need to combat a huge successful store? Developers! Microsoft has launched a new ad that, in a way, knocks Apple's smug commercials by simply saying that it doesn't matter which platform you like, if you are a developer and want to make more money, you have 30 million customers waiting for your apps on Windows Mobile, so come on down!