I bought this just before Christmas to see if my wife really needed an iPhone, turns out she does. . .
Running windows mobile 6.1, although there are sites where you can upgrade to wm 6.5
5 MP camera with auto focus.
3.2 inch TFT WQVGA screen
Blueooth 2.0, USB 2, Wi-Fi and GPS
This is the 16 gig version and has a mirco SD slot
It come on Orange but is unbranded (I can't tell if it's unlocked as I don't have any other sims), it comes in a branded Samsung box with an Orange wrapper.
Comes with an Orange payg sim with £10 credit.
I'll supply the till receipt so it can be taken back to any Orange store if it needs to be.
Its been run for less that 2 hours, has never left the house and is (I would say) as new.
Review here: http://www.mobile-phones-uk.org.uk/samsung-omnia-i900.htm
I'll ship by royal mail next day.
Payment by ppg or bank transfer.