I'm working on putting together a (working) mock up of a few pages on the Steam store using what I've learned with Enhanced Steam about how people use it. Obviously I'll have a few "Enhanced Steam" features, but also obviously not all of them.
I'm planning on mocking up the home page, an app page, and maybe 1-2 other pages such as the "download Steam" page and the news page. I've set up a site that these pages will live on, and once I'm done and satisfied with the design I'll be forwarding the URL on to Valve.
Feeling much better, thanks for asking. Unfortunately I have to have another done next month, but I should be fine.