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Tech Job Interviews Are Out of Control
(www.wired.com)
This is a most excellent place for technology news and articles.
I don't want them to see my hobby code, it's far worse than my professional code.
I recommend having a public portfolio. You needn't have all your hobby code be public, but I think having source you've written available is an advantage.
When I was doing interviews, I definitely looked at GitHub (etc.) profiles of they were listed on the resume. I even found at least one indirectly -- either from their email or LinkedIn.
I like to point people at my accepted patched to open source software (Git and a Haskell library).