Currently if someone posts here (or in similar forums elsewhere) there is a convention that they should disclose if they comment on a story related to where they work. It would be nice if the same convention existed for anyone who had more than say, ten thousand dollars directly invested in a company/technology (outside of index funds/pensions/etc).

A browser plugin that showed the stock portfolios of the HN commenter (and article-flagger) next to each post would be absolutely amazing, and would probably not surprise us even a little.