basically, a bot is a user on forum, you send it some coins. it then monitors your comments, and if you say "tip user XX with YY amount", it sends the coins to that user for redeeming.
I'd definitely give it a try. I don't know whether it would fit HN as nicely as it does Reddit, but there is just one way to find out, isn't it? :)
edit - I also wonder how it would evolve on HN. I could imagine using it here not for tipping, but for crowdfunding of sorts. With so many vcs reading this group, I'd expect people throwing 1-2BTC at a time at good ideas/ShowHNs to support some of the entrepreneurs.
basically, a bot is a user on forum, you send it some coins. it then monitors your comments, and if you say "tip user XX with YY amount", it sends the coins to that user for redeeming.