Plotting 3d points

[Rasmus Kjeldsen]

Anybody know of a simple way to plot 3d points? Nothing fancy, just points.
I've tried looking into Mayavi, but can't really find out how to get get 
3 arrays (x,y,z) into a vtk file. I've also seen mlab mentioned, but how 
do I install that, and import it? I can't get the examples i've seen of 
mlab to make any sense (the importing the module part, that is!).

Rasmus Kjedlsen