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I'm a fan of these easter eggs. Especially when it fits with the theme of your site (apparently he's very into js). I started implementing a similar concept on my site awhile back... didn't quite finish, but any kings quest fans out there might get a kick out of my working concept:<p><a href="http://www.robscanlon.com/kq/" rel="nofollow">http://www.robscanlon.com/kq/</a>

"Sorry the princess doesn't put out. Let it go" - Really? (at the end of the level)

Tacky message at the end totally ruined it. That is going to lose you sales.

An added easter egg: he stores mario's position in a cookie, so when you return to the site, mario is where you last left him: mario-data=2008%2C190%2C10

It may be a stretch of the word 'playable', but pretty neat.

Amusing, but its use of the arrow keys breaks scrolling.

Like the endlessly falling Mario if you drop off the world in the crack. Goes off the bottom, re-appears on the top and falls through ad infinitum.

Woah, I thought it would be too distracting before I clicked through, but it actually wasn't. Great way to keep your site fun and original.

Wow, I used to chat on an IRC server that guy hosted on this domain. Small world.

A little bit ironic to sell a book about HTML5 games using IMG tags for the background game.