iTwinge produced by Mobile Mechatronics, is a keyboard for Apple's iPhone. It does not require any software to work with the iPhone. It is attached to the iPhone and then you can type you emails and messages. <video>http://www.youtube.com/v/Kfe3HIwv2gg</video>

iTwinge draws power from the iPhone. It is attached to the bottom of the iPhone and mimics the virtual keyboard of iPhone. It makes it easier, less error prone and faster typing in iPhone. It is compatible with iPhone 3G and iPhone 3GS.

However, it obviously covers up a good 40 percent of the iPhone's screen, which would seem problematic. - David Carnoy, CNET http://reviews.cnet.com/8301-19512_7-10354452-233.html

Having to slide the holster on and off between emails (to use the screen again) could be a pain in the ass, though. - Danny Allen, Gizmodo http://gizmodo.com/5362350/itwinge-iphone-keyboard-video-makes-me-cringe-a-little-less

Regardless, after 4 hours of usage an "average user" will increase typing speed by 30% to 40% with 70% to 80% fewer typing errors. - Thomas Ricker, Engadget http://www.engadget.com/2009/09/16/itwinge-the-perfectly-named-iphone-keyboard/