Emulating USB - control a Keyboard

Hello, I am trying to get a USB keyboard and basically hook it up to an Arduino. What I want it to do is display the key/keys that were hit. I have an Arduino UNO, Mega, Pro, Duemilanove, Ethernet, and a bunch of Arduino clones. Is it possible to connect the USB keyboard to any of these Arduinos without any additional Hardware? Thanks Simon.

Not really. In order to read a USB keyboard you need a USB host device, something like the USB host shield.

Well, I am giving it a try with multiple different tests, Right now. I'll keep you tuned.