Looking at Waterstone's chart, the top 5 are as follows:
1. Dan Waddell - The Blood DetectiveSteph at Wheredunnit has just bought a Sony e-reader and makes a plea for authors to try and get their books into e-format.
2. Mark Pearson - Hard Evidence
3. Stephenie Meyer - Twilight
4. Stephenie Meyer - New Moon
5. James Becker - The First Apostle