Mobipocket Reader eBooks work on the Blackberry 8100.
The best eBook format for the Blackberry 8110 is Mobipocket.
Mobipocket Reader eBooks work on the Blackberry 8120.
The best eBook format for the Blackberry 8130 is Mobipocket.
eBooks for Devices -- Smartphones, Palms, Pocket PCs, Blackberry