How about Eport as Blend

I dont know if it would be complex to make
But it would allow for selecting a few objects in your scene, and to save them separately (your own assets folder or so).

Then later one could link them for example in another project.
While mean while improvements would be reflected in all files that link it too.
It would be nice for building assets.

Export Selected addon http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Import-Export/Export_Selected


That Addon didn’t worked for me few times. So i’m just appending a needed object to a empty new scene from the scene i wanted to export from. Works for me.

Ctrl-C your object, open new Blender instance and Ctrl-V does not work for you?