Groklaw partially filled the function that you are describing. However Groklaw was paranoid about not giving legal advice so all discussions of legal matters on Groklaw stopped short of actual legal action or even advice on how to carry out such action.
One way to approach this issue is to submit an amicus curiae in court cases where you think an explanation of open source software is relevant. It is too late to do so in 21st Capital Corp. v. Onodi Tooling & Engineering Co. but you could submit an amicus curiae if that case is appealed further.
Groklaw partially filled the function that you are describing. However Groklaw was paranoid about not giving legal advice so all discussions of legal matters on Groklaw stopped short of actual legal action or even advice on how to carry out such action.
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Steve Stites