With App Store marketing you have to describe your app with just the title and logo. By punting on logo you're losing 50% of your descriptive levers for getting rank traffic.
http://news.ycombinator.com/item?id=745858
http://spreadsong.com/icon_driven_development_on_the_app_sto...
Tried to find more info, but the Spreadsong blog seems to be MIA without a direct link to a specific entry.
http://cl.ly/3O3H300K3C3p423G2i2Z
It's another bookshelf icon, but the colors and style make it stand out in the app store listings.
Key is to stand out relative to competition, in the common ways users find your app.
Downloads and sales have more than doubled since the change, though we also redesigned the app interface itself in the same update.
The strong border sets the icon apart, and in fact I notice that you have a similar border in your icon!