Yahoo on Wednesday announced at the CTIA Wireless trade show that it would open up its Blueprint mobile platform to developers who want to create applications for Java, Windows Mobile, and Symbian devices, as well as mobile Websites. "Yahoo! Blueprint solves the most challenging problem plaguing today's mobile landscape—now with one click, you can write once and have mobile services run across a critical mass of devices and operating systems, potentially reaching millions of users," said Marco Boerries, executive vice president, Yahoo! Connected Life.