Business 2.0: Like many other Treo fans, had been looking forward to the new 650. It boasted Bluetooth wireless, a much-improved screen, and a keyboard that was a delight to type on. Would it be worth dropping $600 less than a year after buying (and abandoning) the 600? Despite my familiarity with the 600’s buttons and keyboard, I found the learning curve on the new device was steep. For complete review go to Business 2.0 website.