As I recall somebody saying part of the resume problem is the swarm downloads, I think part of the solution would be to save each download as a separate file, then merge the files when they are all done. (ie save File A as File A (1 of 5, goal: 0 to 100 kb), File A (2 of 5, goal 100 to 200 kb) and on down the line). When these are merged, these fragments can be deleted, either by the program or manually.