Thanks everybody for your comments.
It does sound like the C1000 is not going to be great for outdoors use, but this was really more a curiosity thing than any burning need for an outdoors PDA.
I do use my PDA (what ever it might be at the time) for watching movies, or playing a game of quake,on the bus going to work quite a bit, but I am guessing the Z should be able to cope with that.
I also find that the anti-glare screen protector from boxwave that I use on my Axim helps in the sun and as it is the same physical size screen (from what I can work out) then I might give that a go as well.