One of the most-hyped features of the HTC Evo was the front-facing camera. Some (including Steve Jobs) believe that video-calling is part of our mobile future. Qik provided the two-way video calling app needed to take the Evo's front-facing camera and make it useful. Unfortunately, they have been just as swamped by the Evo's success as Sprint's authentication servers.
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Phandroid reports that the Qik video calling app has been pulled from the App Market until the company can add more servers. Volume has increased by 20x, forcing Qik to stop new downloads in order to compensate. The company has posted a statement about the whole mess on their blog.