Are e-Book readers up to the job of replacing books yet? Find out from Russel Smith's comparison of the latest models with the Bio-Optic Organized Knowledge device.

After several years of argument, Ross Anderson of Cambridge University has persuaded his publisher to let him put his book "Security Engineering" online for free download.

The publishers thought for years that it was too risky to let authors put books online but they are gradually learning that this isn't so. Putting a book online often increases its sales; more people read it and those who find it useful often go buy a copy.