Java #1 sought after Linux skill? Interesting, though author qualifies this with his POV: "I was initially surprised that Java was the most referenced skill area, even over Android and C++. But then when I thought about it, it seems that Java is everywhere you look these days, even if it isn't called Java (such as Red Hat's Ceylon language and Android's Dalvik virtual machine). This also seems to enforce the notion that Mono--and C#-- development is falling more out of favor on the Linux desktop."
Zenobia's comment makes me ask this question which is slightly off topic: When employers hire open source talent, and they're vetting applicants, how closely do they look at say, for a lack of a better word, an applicant's online footprint? Are they concerned if the applicant is active in specific organizations, forums, etc. If yes, which ones?
Here's some salary data. It looks to be a couple of years old, but gives you some idea of what open source skills might draw in terms of salary, and where.
http://fosslc.org/drupal/node/239