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For Microsoft, and Amazon.com, and the clutch of other companies that hope to carve out a big slice of a mobile computing business currently dominated by Apple, the future depends on people like Scott Porad. As chief technology officer of Cheezburger Network, a popular publisher of humor websites, Porad has to make the tough calls on which mobile devices merit the development of special software, or apps, that will make the company's content shine. Developing apps for the hot-selling iPhonemight be a no-brainer, but that's not the case when it comes to apps for Microsoft's new Windows 8 software, or for the various versions of Google's Android mobile operating system, or for Research in Motion's BlackBerry devices. "We are a small company and we don't have unlimited resources," said Porad "We cannot afford to do it all, that's for sure." Cheezburger, an independent publisher with 85 employe...

Signing certificates for Android apps are a seemingly simple thing, but it can get a little more complicated when you develop apps for a client. If you’re not familiar with signing, you may want to read Google’s instructions on signing Android apps . Read on for a few things to look out for when you build apps for a client. Why signing keys are important First, the obligatory reminder: Back up your keystore–without it, you can never update an app on Google Play again. You would need to create a new app and start over. This is because once an app is released to Google Play, all future updates must be signed with the exact same signing certificate. No exceptions, no excuses. Now, backing up your keystore may be easy when you’re developing apps for yourself, but what about when you’re building apps for a client? What if you have a very large number of clients, each with a different certificate? The same rules a...