Amazon is expected to release a wireless e-book reader this October called Kindle. It's anticipated to be priced in $400-$500 range.
Also in the fall, Google is expected to offer charged access to the complete contents of digital books, with pricing to be determined by publishers.
Source: Stone, Brad. "Are Books Passé? Envisioning the Next Chapter for Electronic Books." The New York Times, 6 September 2006, C1, C9.