I am a depressive myself so have some experience, and dislike any idea that somebody might avoid employing me/feel leery about my advancing in the workplace because of it (even posting about it here makes me feel uncomfortable because of this stigma.)

Though I applaud the idea that people become more aware of the risks esp. in the computing industry/startups, I think the idea of assessing it being part of due diligence would simply encourage more stigma about it - 'who wants a 'crazy person' in charge of our money?' many will think, sadly.

Anyway, on the subject of depression I have a lot of experience so if you want to talk about that if it'd be of any benefit, feel free to email me (see my profile) :-)