In no particular order.
1) The ability to sort by Title, Author, Genre or Filename
2) The ability to create sub-folders and have the Cybook only display what's in there (sorted as in 1 above).
3) The ability to display without thumbnails which slows the Cybook down so much.
4) The option to display battery status at the bottom of the page.
5) Better fonts.
6) Better sync.
7) A full backup-to-PC option.
8) Zoom and Pan function. Useful for maps, drawings, PDF, etc.
9) The ability to use the Cybook as a reader while plugged into an USB port.
10) User configurable button(s)