At present, Eink (nee PVI) and SiPix are the two active suppliers of eink displays.
Fujitsu and a couple other outfits are trying to break in with products based on slightly different technology, aimed mostly at reflective color displays but for now the game is mostly PVI and SiPix.
http://www.eink.com/index.html
http://www.sipix.com/index.html
Hope this helps.