Salut Sam, I was thinking about hash and files and got a little idea. Often you get results of files with the same size and same name but different sha1. An optimisation would be that once you download one file LW gets the tiger tree of the other files with same size same name: if some trees correspond, LW downloads from both files (more sources). The tigers that differ are only downloaded on the the file selected to dl by user. Of course you don't add sources with different sha1 in the download mesh.
I had another idea for uploads but I forgot it today
