While a number of these are, well, meh, there are a few that are truly outstanding. One of these winners is the Logitech .

TECH ARGUMENT:

While finger-based input works fine with the iPad in many situations, when you're trying to take notes in a meeting or editing a document, ease-of-use goes right out of the window with the on-screen keyboard and you long for a real one. The Logitech Fold-Up Keyboard for iPad is one of the best solutions I've found.

When you first unpack the keyboard it looks to be just a tray into which you slide your iPad 2 (this product isn't designed for the original iPad) with cutouts for the iPad's power and home buttons, the dock connector, the volume rocker and the rotation lock switch.

But hold the iPad locked into the tray in landscape mode with the home button on the left and push a button on the top edge of the tray and gently lift as you do ... and, voila! A Bluetooth-enabled keyboard unfolds, origami-like, from inside the tray!