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that's the global list, but the per category list that OP was talking about is on iTunes desktop only. So pretty much worthless.

Nope, press "Categories" at the bottom and select a category to see the "What's Hot" for said category.

Eh, I don't see this on my iPhone. Selecting a category (from the tab at the bottom) shows Top Paid, Top Free, and Release Date.

No "What's Hot".

I think the iPad and Mac App Store interfaces include it, but the iPhone doesn't.