I wish people who do "Show HN" projects like this would consider implementing throwaway accounts. More than anything, what I appreciate about some of these projects is their low-friction-low-commitment approach to user experience.
Not sure what you mean - are you saying that you wish it were easier to create an account to try it out?
No. By throwaway account I mean having a button that says "Generate a throwaway account for me", which then causes the back-end to generate a random hex string. The user then clicks on http://omgsmackdown.com/58d7875171f9b6a4c22d6b46e4da9b26 and may optionally associate a nickname with that identity, but from that point on, the user is logged in as far as the app is concerned.