Why not to offer a service that would allow computer users to upload deleted files from their desktop recycle bins for storing them in a global public recyclebin? Anyone is free to scavenge for salvageable material, download and reuse it.
Once the volume of submissins reaches, say, half a million uploads, the site will introduce a public contest to reward the best recycling ideas, for example re-use in digital arts, in sociological studies, etc.