Today in Cleantech

E Ink is showing off new e-reader displays that refresh faster and sport better contrast ratios. Good news for avid (speed?) readers, but will they arrive in time to help devices like Kindle and Nook fend off the iPad and the impending onslaught of tablets and their requisite e-book apps? Well, the Kindle 2 is getting a little long in the tooth. As mobile gadget refresh cycles go, that is.