Pandigital has actually released a firmware update to make these just an android tablet. The black ones have a matte screen, are lighter, but less responsive to touch. The white models are completely different hardware, Samsung processor, better touch screen, but heavier and slightly larger.
Pandigital supports Android 1.6 for both models, white and black.
If you want to fully hack it with custom firmware, only the white one is fully supported up to Android 2.0, and installs google marketplace, which you can use to make this a Kindle! You can read all your Kindle stuff, plus search the web, watch movies, load pics, etc, etc. Web browser is nice.
One downside, if you are going to use this as a tablet, remember its only a 500MHZ processor and a 600x800 screen, so it's no iPad killer, but it sure makes a great book reader!