Finally, there's a product that puts a wireless hotspot in your pocket: the MiFi, a battery-powered device the size of a thick business card that provides its own password-protected wireless network (NYT's David Pogue reviews here). This is cool for all the obvious reasons -- with MiFi in your pocket, your computer, phone and iPod Touch are connected to the Internet whether you're on a road trip or the beach. But it's especially cool for a reason Pogue doesn't mention: It could signal the end of cell phones.
http://business.theatlantic.com/2009/05/why_you_wont_need_a_cell_phone_starting_may_17.php