Brook's worldbuilding skills are impressive, her Iron Seas setting rivaling Cherie Priest's Clockwork Century for potential stories, and I daresay its backstory is actually a bit more compelling, despite my general preference for American-flavored steampunk.
If your core pitch is your "innovative" business model and not what you publish and for whom, your 15 minutes are almost up.
While Epic Mickey can certainly be used as an example of transmedia development, I'd argue that the process only got it half right since there doesn't appear to be an integrated marketing plan in effect.
While Twitter has only become even more valuable since then as a professional networking tool, I still look to blogs for deeper engagement, and subscribe to feeds of blogs that offer real value.
In the old days, that platform was the physical bookshelf in a brick-and-mortar retailer. Today, it's a combination of email and ecommerce.
The plan for 2011, or at least part of it, will likely include continued defragging of my online presence and repositioning this site to once again be Command Central: All Things Guy -- writer, poet, marketer, publisher, optimist, malcontent -- no matter what new interests and passions the new year may bring my way.
Part collectible card game, part treasure hunt, augmented with an immersive online community, Perplex City offers a number of interesting takeaways for anyone wrestling with how and where audience development and transmedia intersect.