Other than @PMUK’s suggestion for one project as a demonstration, the thing you should be doing is giving “base ability” to a range of new folk you want to attract into Elements long term. That’s blog/publisher (more sophisticated than microBlog), online retail, service, organization, family, non-profit, church, perhaps a few others (perhaps a database [via CMS] type of project of some sort).
Why this list? Because the sophisticated Web designer needs more of what @PMUK suggested (e.g. demonstration), whereas someone completely new to designing Web sites and mostly for personal or a single use, needs a functional project as a starting point (much like the old iWeb, Sandvox, Rapidweaver customer originally was). You need to hook newcomers into the base use and essentially up sell them over time, as the pool of true Web designers is actually somewhat small, and they tend to know what they’re doing.
This is actually my only true worry about Elements: can it grow organically from the bottom by attracting new-to-design users. If it can’t, then it eventually sputters, I think. Not being in the App Store makes it a little more difficult. A lot of those folk you really want to hook are those now gravitating to the MacBook Neo. They’re not reading Mac sites, so they’re not seeing that Elements is even available, let alone understand what it is and might do for them.
Apple doesn’t make it easy for developers any more. I don’t understand Apple’s Developer Program at all, other than Cook figured out a way to make 30% off of other people’s products and greedily wants to hold onto that.
By going completely vertical (app, store, host), you’ve boxed yourself in a bit, too. The question is what do you have that’s going to attract new-to-web-design folk? Vertical only helps with that if you can find and hook those folks in the first place.
By the way, in your Get Started Fast section you have Artist, Portfolio, North Eleven, Link In Bio, Landing, and Fitness. Hmm, if I’m not an artist or a gym, that might not make any sense to me looking at that page. Doesn’t sound fast if I’m an online retailer, publisher, et.al. Which is why you need a better set of Projects and ones that immediately are recognizable to someone just entering.
Likewise, you’re missing a Gallery of Sites Made with Elements! As you’re well aware, the diversity of said sites is pretty remarkable already, but nowhere are you promoting that. You need the “wow, if they can make that with Elements, maybe I should look at Elements” factor.