the best answer is another N900 bt if you still want an option then..

HERE YOU GO... Fujitsu-F-07C


Hardware:
- Full qwerty Keyboard
- Camera
- 3.5 mm Headphone socket

Software / OS:
its full "Windows 7 Home Premium"

It's the world's smallest PC that fits into the palm of your hand, and it runs Windows 7. Not Windows Phone 7, but the actual 32-bit Windows 7 Home Premium (with SP1)
with a 4-inch SVGA touchscreen (1024 x 600), a 5.1MP camera, a 1.2 GHz Intel Atom Z600 CPU, 1 GB of LPDDR400 memory, a 32 GB SSD and IEEE802.11b/g/n connectivity with speeds up to 65 Mbps. There's also a USB port for connecting a keyboard or mouse, and an HDMI output jack for connecting to an HDTV. There's even a slide-out QWERTY keyboard for typing on-the-go.

P.s. - i guess since its x86 it can handle any Os supported by a regular Pc including Fedora,debian & Ubuntu