The first batch of computers built for the One Laptop Per Child project could reach users by July this year.

The scheme is hoping to put low-cost computers into the hands of people in developing countries.

Ultimately the project's backers hope the machines could sell for as little as $100 (£55).

The first countries to sign up to buying the machine include Brazil, Argentina, Uruguay, Nigeria, Libya, Pakistan and Thailand.

The so-called XO machine is being pioneered by Nicholas Negroponte, who launched the project at the Massachusetts Institute of Technology's Media Lab in 2004.

The laptop is powered by a 366-megahertz processor from Advanced Micro Devices and has built-in wireless networking.

It has no hard disk drive and instead uses 512 MB of flash memory, and has two USB ports to which more storage could be attached.

The computer runs on a cut-down version of the open source Linux operating system and has been designed to work differently to a Microsoft Windows or Apple machine from a usability perspective.

Instead of information being stored along the organising principle of folders and a desktop, users of the XO machine are encouraged to work on an electronic journal, a log of everything the user has done on the laptop.

The new user interface, known as Sugar, has been praised by some of the observers of the One Laptop Per Child project.

The machine comes with a web browser, word processor and RSS reader, for accessing the web feeds that so many sites now offer.