The medium is just waiting for the game devs now: remember back in 2004 when someone wrote a brilliant pretty-much-exact copy of Lemmings in the browser? Well, it's taken 9 years and the HTML5 buzzword to start getting game devs to start poking round in the space. Now that it's started we can move past all of the basic nostalgic tech demos and start writing some more innovative stuff!
[Edit: it's back online, woo! http://www.elizium.nu/scripts/lemmings/]