Found a couple links to articles that discuss Linux usage across a number of different markets. Just citing the authors:
- 88% Of Top 500 Super Computers Running Linux
- Linux Android OS ships on 60.5% US phones, 87.7% in China.
- 64.2% of websites run on Linux/Unix (excluding MacOS)
- Linux use in embedded devices forecast for around 70% by 2012
All of the above noted, Linux desktop usage still hovers around 1-3%