MobileRead compares the specs of the recently announced iRex Iliad (December 2005) and the Sony Reader (January 2006, successor to the Librie):
Dimensions:
Sony: 6.9″ by 4.9″ by .5″
iRex: 6.1″ by 8.5″ by .63″
Weight:
Sony: 8.8 ounces
iRex: 13.7 ounces
Screen:
Sony: 6-inch SVGA 800X600 4 grey scales (same like the Sony Librie)
iRex: 8.1-inch XGA 1024×768 16 grey scales
Internal memory:
Sony: ? [...]