The iPhone and Palm Pre together are dragging down BlackBerry sales, according to estimates by Piper Jaffray analyst T. Michael Walkley. Both the iPhone 3GS and the $99 iPhone 3G have hit the BlackBerry the hardest, as some June customers at AT&T were buying one of Apple's devices in place of similarly priced phones from Research in Motion, like the Curve 8310 or the Bold. BlackBerry sales at th
