There seems to be some discussion about exactly what "standard journalistic ethics" is. Some people would probably prefer disclosure in a case where, say, MG Sigler writes about a company that Arrington invested in. TechCruch feels that no disclosure is required in such cases because of their unique lack of editorial oversight (translation: apparently "TechCrunch" is just a bunch of independent writers who don't talk to each other).

I think it would be more accurate to characterize that dispute as being between TechCrunch and the rest of the entire journalism industry. I don't think anyone else thinks that what TechCrunch would like - selective disclosure, because "you can trust us" - is a good idea.