Amazon is making a Kindle app for Microsoft’s new smartphone operating system—Windows Phone 7 (WP7)—and an official Twitter client app has just launched. WP7 passed the 1,000 apps mark earlier this month before launch and besides just all the wonderful Xbox Live functionality in the OS, the smartphones running it are looking quite good. Now ...

Microsoft’s coming Windows Phone 7 (WP7) Marketplace has a lot to live up to. Competitors like iOS and Android have apps numbering in the hundreds of thousands already and WP7 smartphones are not even on the market yet. Without a successful market for apps, the platform could die before it even gets off the ground. ...