[loceng]

It certainly wouldn't hurt for HN to add some JS to check for 'Show HN' in title posts and prompt to confirm they're following this rule.

[dang]

That's on my list to do. But the code would be server-side, as nearly everything on HN is.

[O_H_E]

It would be also a good idea to promote that page a little more. I have gone through the guidelines and FAQ multiple times checking for stuff, but never saw a link to the said page.

[dang]

Good point! I'll add that to the list too. We should at least include it in the FAQ.