The Nokia N900 is an amazing device. We know it is capable of dual booting either Meego or Android alongside it's resident Maemo OS.
The device features a 3.5 inch touchscreen display, 5 megapixel camera with dual-LED flash, 32GB of internal storage which can be expanded with microSD, a full QWERTY keyboard and is powered by a 600 MHz processor.
But we see it's limits tested with four operating systems running on the device: Maemo, Meego, Android and Kubuntu Mobile.
source - MyNokiaBlog