Occasionally someone will post a brilliant comment that I'd like to follow up on privately.
Is there anyway that I can send the poster a private email? I know that some forums have
that feature, but I can't seem to find it here on the cow. Is that intentional or an oversight?
This is intentional. This sort of feature would end up being abused, so we have decided to keep conversations open. However, you can converse on a user's profile page, if you are COW friends. We try to protect our user's from any potential spammers which would try to use our system.