Funny that you mention Homestar Runner -- I've recently introduced my daughter to that site, and she loves it. And while I'm watching her play with it, I marvel at how that kind of rich interactive experience (the sbemails with clickable text Easter Eggs, for instance) was available back then, and it seems like we've pretty much backslid from the functionality of a site like that with HTML5 -- if it's available in HTML5 and Javascript, it's still nowhere near as easy for nonprogrammers to author that kind of content without Flash.