The first thing you should do is to update your SO|SE profile linking and describing [Six to eight][1]; learn to sponsor yourself.  
Then try to became the new Jon Skeet  (John has **156106** views on his profile), ok just kidding here.

I think we can't market our apps here on StackApps, we don't have enough audience and this engine, with limited appysh feataure, can't be our Apps-place.  
Check my answers [here][2].  
In brief:
>> StackApp should be improved
> introducing a well organized
> stackapp-store section, splitting
> technical stuff from Apps.
> > 
> StackApp should be advertised: the
> first noob to the oldest guru should
> know the existence of StackApps. Imho
> StackApps is currently used by a small
> small niche of Meta aficionados users
> that is a small niche of the 200K
> users of just Stack Overflow. Add a
> Tools tab to the header, place a big
> banner..whatever you want. I think a
> small link on the footer and blog
> posts are just not enough.

I even think that SO staff has not enough resources, time and interests to build an app-store for our apps.

That said, I have two proposals:

1. Improve the great [StackList][3] with full blown domain, sexy layout and massive ads
2. Propose on meta an [advertisement bar contest][4] for our Apps 


  [1]: http://sixtoeightapp.com/
  [2]: http://meta.stackoverflow.com/questions/55163/area-51-site-proposal-stackexchange-api-application-development
  [3]: http://stacklist.quickmediasolutions.com/
  [4]: http://meta.stackoverflow.com/questions/31913/open-source-advertising-sidebar-1h-2010-closed