Currently the intended role of StackApps.com is not entirely clear.
Right now, it seems to be focused on shaking out the bugs in the API and providing a somewhat noisy area of app announcement, via the 'apps' tab, that to a non-technical user just looking for a cool app is likely to be intimidating to the point of being unusable.
If the 'apps' tab is intended to ultimately be an end-user resource for finding apps, it will have to be redesigned to be more app-store-ish and controlled by more than adding a tag.
But what I do not see a lot of is 'How can I do xxxx with the API?' and 'How to do xxxx?' with the API, basically an API app developer centric site with code snippet heavy content similar to Stack Overflow..
Here is the Area 51 proposal for such an API app developer site: