Apple CEO Steve Jobs today unveiled the worst-kept secret in the Silicon Valley: Apple's tablet PC, dubbed the iPad. It sports a lower-than-expected price tag  (starting at $499) and a few surprises. And, in a nutshell, the iPad is potentially one of the most important, culture-changing tech products in history, because it can replace all media, according to Datamation columnist Mike Elgan. Read his informative yet concise rundown of the iPads features and specs here. You can find the video about the iPad Steve Jobs showed during his presentation and more information about the 1.5 pound, half-inch thick tablet with the 9.7-inch LED capacitive (multtouch) display that can run over 145,000 iPhone apps out of the gate here at Apple's website.