[davb]

I never look at them, at all. Some of the worst programmers I've met have got some fantastic portfolio/showcase work on their github. Conversely some of the best coders have no OSS contributions at all.

In all, I find it to be a fairly poor signal. I get a much better feel for someone from conversation alone, and some well thought out questions about someone's previous projects and workflow usually tell me all I need to know.