Bookeen Cybook Gen3
6" E Ink, 8-levels greysacle, 170dpi
The Cybook Gen3 is a linux based e-reader. It has 512Mb of memory (and an SD card slot), weights just 174 grams and connects via USB.
The Cybook supports the Mobipocket format that includes books, dictionaries and News sources. it is available now for 350$.