Awesome, glad to see Linux is coming along, however slowly but surely.
This stat come from W3Schools log files. I don't think a site about web development is a unbiased sample.
The absolute value means very little. However, the long term trend of what the counters show can be interesting. For all the OS marketshare counters I know of, I think its undeniable that Linux has been increasing. Slow but steady pace.
I guarantee you that desktop Linux is well south of 2%.
Maybe 2010 is the "Linux Year on the Desktop."
Statistics are fun!
Here is 2 years of Linux marketshare data. This site estimates it more near the traditional 1%, but notice that there are big boosts in May and less prominent, but still present, boosts in November.
I'm not saying that it has anything to do with the fact that Ubuntu puts out releases in late April and October, but that just might have something to do with it... ;)
How many people using something that is free is something very hard to gauge.
2 years ago, I still didn't know anyone personally who used a Mac. 5 years ago, I wasn't aware they were still making them. I would have guessed less than 1%, or about the same as Linux. Apple does record sales numbers, and they are much higher than 1%.
Or just get Level3/GlobalCrossing/Internap/Cogent to do it ;)