I tend to reuse a lot of the materials I create, but currently the only way to reuse a material is to import it from existing files. Sure, you can create a library by storing all your materials in one file. But that too will end up being a pain in the rear (if you collect a lot of materials and/or want to update some etc. Just to add a new material to such a file isn't that much fun..).
It would be really nice if there was a (optional? i.e. add-in) feature in Blender that would let you easily collect the materials you create in one location, where you could review and edit them.
And it would be awesome ( ;?D ) if it also could keep track of 'sets of materials', as there's times when you actually use multiple Blender-materials to recreate one "real world material".


NOTE: When I use the word "material" it's implied that it also includes textures that's connected to the materials.
NOTE 2: This should of course be a local library. But as a bonus it would be nice if there was some way to share a library within a project/company..

I hope (and think) that there's more than me who would like this.