WikiReader from Openmoko is exactly that. A reader specialized to read an electronic local copy of wikipedia.

[edit] Features

• Touch screen
• power: 2 AAA cells last up to a year.
• reflective screen - works in sunlight
• price: $99 US
• uses micro SD card
• updates: twice a year on micro-SD card for $29 per year.
  • or download for free if you can deal with a 4+ Gigabyte download.

[edit] Specifications

• Screen size: 240 x 208 pixels
  • approximately 39 characters x 10-12 lines as shown.
  • 3.5" diagonal 2.375" tall x 2.75" wide
  • Monochrome
• 8GB microSD card included.
• Power supply: Input Range 2.1 to 3.4 volts, 2 * AAA batteries.
• Processor Epson S1C33E07 Micro controller
• RAM: up to 32 MB
• Boot ROM: 64KB Flash
• Touch screen: Capacitive Touch Panel
• Three function keys
• Debug connector: 8 pads under a seal in the battery compartment

[edit] For more information

• http://thewikireader.com/
• http://openmoko.com/ - The designers and manufacturers.
• http://wiki.github.com/wikireader/wikireader - wiki for this reader