I have a simple suggestion for new assets being put into the marketplace. How about using a root directory of Marketplace? Right now assets are all over the place and sometimes difficult to find.
where Marketplace is a common directory name
StudioName is the name of the person or studio that created the assets (Say JazzJackrabbitStudio)
Projectname is the name of the asset pack purchased (Say AdvancedRabbitEffects)
Just a thought. What do you think?