I would recommend detecting if javascipt is enabled on the landing page and putting up an "enable javascript to see how it works on this page" message.

I had javascript off when I got there and didn't realize I was missing something until I read the parent comment.

Also - the service looks useful to someone like me who isn't much of a web designer but has a vanity site and a blog. I should say I am allergic to javascript bloat that slows down load times, so you'd need to keep speed your top priority for me to use it. I used to have adwords on one of my pages but took it off b/c it was the slowest thing on the page.