Has anyone come up with this idea, or is working on it?
A library window (like Flash....) where you can store objects and stuff for easy use later on? It would be specially useful for game makers...

I don't check all the forums so I don't know...

The way blender is setup you would just use a blend
file to store your library of objects/materials or whatever.
Try appending an object from a seperate blend file sometime
to see how it works.