The Raspberry Pi foundation just released an update to the Model B.
And the changes makes this firmware even more interesting.
The new model has 4 USB ports. They are still on the same bus as the Ethernet but they have more power now. Up to 1.2 Amps can be delivered to the ports with a good PSU (2A).
That means, it should now be able to power USB HDDs and devices that need more power.
Also it has a much better layout and now supports Micro SD.
And it uses less power, when not powering a lot of devices of course.
It should be 100% backwards compatible with the Model B. Same CPU, memory and so on.
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Also same low price as Model B.