NBC is owned by GE, that doesn't restrict NBC Nightly News from reporting on the weapons made by GE that were used by and against Libyan rebels. I understand the levels of separation are a lot deeper with GE/NBC, but as long as full disclosure is given about his relationship with Crunchfund companies I don't see a huge ethical problem.

That said, I really don't see why Arrington would want to try wearing both hats. It brings a huge magnifying glass onto the bias in his articles, and possibly the articles of all those at TechCrunch.