Not seen any out and about, my local Vodafone shop doesn't have one out on display or any posters up. Don't really go into any other phone shops to have a look, nice to know that the handset isn't as popular as the iPhone I suppose!!
Just saw first one yesterday evening. As I was coming back from office and was in my apartment lift. Another guy came inside and took out his shiny N900.
I smiled and thought, another N900 and that too in same apartment :-) May be I will visit him someday to share each other mod and hack.
Only last week I have spotted the first N900 other than mine in the hands of a woman obviously busy playing a game in portret mode while hold of a toddler reaching out for it with sticky pawns.
The husband was sitting in front of them with a white Nokia E71 laying on the table. Then I looked at my wife sitting next to me playing Mahjong on my N900 and because of the funny resemblance only people on this forum may observe I felt less bored having to surf on her white E71.
Some days it's like stepping back in time.