It’s a single App market with categories. You can even do a search if you know what you’re looking for and find it faster that way!

The only problems with it is it could be better organized to make it easier to explore and the choices are still very limited.

The original Beta version ran extremely slow and tended to crash but the new version runs okay even on a netbook.  They just need to better optimize the interface to make it easier to navigate and easier to explore between categories instead of having to always go back to the main menu.

Most of the apps are also for low powered devices like netbooks.  So the apps tend to be pretty basic and the selection is so small that you can look through the whole collection in one evening.

Like any market, it will have to grow and start offering more interesting Apps before it becomes more popular.