Doesn't make any difference so far as utility is concerned; you can't really see the window side of the blind so the from inside the room so the look of the thing doesn't matter either.
The fabric side of the blind should face the room, the plastic side against the window. The fabric side would get damp if it was facing glass wet with condensation, especially if it was touching off it.
cheers niallman and fraggle, had the bright idea to just ring a blind shop i had got a price off this afternoon and yes your right....just had a few days of panic praying plastic side wasnt to the bedroom. hated to ring man in shop as he's probably sick of us but finally have them ordered......