Sony, a company known for its insistence on proprietary formats, has announced that it'll be supporting the open ePub format on its eBook readers from now onward.

The ePub format was created by publishers to prevent Amazon gaining a monopoly over eBooks in the same way that Apple restricts music listening on its iPods. Sony's support is a big coup for the format, which is also supported by Plastic Logic's reader device.

Apple is yet to announce an eBook product, but a much-rumoured tablet computer from the company would likely include some sort of functionality to read ebooks.