Linux/MacOSX/Windows/Vista desktop usage percentages

I was looking at some of the data from the w3counter and thought I would graph it out.

Here we can see that the usage changes very slowly, Windows does have a slight overall decline and both Linux and MacOS have increased slightly.

This shows an increase in both OSX and Linux usage up until Vista overtakes them, then they both level off, its interesting that the 2 coincide, possibly due to large scale acceptance of Vista. Mac usage seems to have fallen off slightly more than Linux usage although both are still higher than they where but not gaining as much ground as they where.