Wikireader

The WikiReader is a neat little touchscreen machine that contains the entire Wikipedia. It's cheapish (99$) and runs on AAA batteries for a supposed 12 months of "normal use." You can even pay extra and get 2 updates delivered to you on microSD cards for 29$. It seems kinda neat and  like it would be handy for kids (it has parental filters built in) or people without data plans on their phones, or those poor souls without internet access at all (although clearly those people will be too busy crying all the time to read wikipedia entries.) Here's a detailed review with lots of pictures.

It's made by OpenMoko who also make the FreeRunner which is a open source cell phone, so it stands to reason that the Wikireader will be open as well, which means it would probably be hackable into a cool little Ebook reader.