I had gotten the impression that linux was gaining a lot of market share for desktop use. But I found this statistics page (scroll down to the os part)
http://www.w3schools.com/browsers/browsers_stats.aspand it appears that in the past few months the usage hasn't really been growing that much for linux. I do understand that some people change there user agents to like IE sometimes but I wouldn't expect the average user switching from windows to do this.
maybe i have been reading slashdot to much but i expected linux to have a little more than 1% growth in the past 3 years.