Is your phone not enough of a tablet already? Looking for another device to truly be the third wheel? If so, the Archos 43 4.3-inch "tablet" is for you. Basically an Android device without the phone, or 3G service, the 43 offers up the hardware and software for browsing the internet, watching movies, and playing games.
The device is running Android 2.2 and features 16GB internal storage as well as WiFi, Bluetooth, 2MP rear camera and HDMI output. It's running on a 1GHz ARM Cortex A8 processor and is available now for $250 from the Archos online store.