Open source jobs: What's hot, where to look

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

Surprised they didn't mention Drupal or PHP. It may not be bleeding edge CS but there are lots of openings everywhere.

I like the approach this piece takes, as it avoids the usual 'learn $foo_language 'cos it's hot!' approach. I hire people who genuinely love their chosen work and who love open source, and who really understand how it works. A good coder can learn any language-- I look for people who understand that any programming language is just a tool, a means to an end. They need to think and reason well, be resourceful, know how to learn, and be dependable. Most of all I look for people who place the end user first, which is something I wish the article had touched on. I also like that it mentions the myriad other disciplines that are part of any software project.