SMM, SanDisk Media Manager needs some serious updates.
With luck, future version will have a better, easier interface. For example, with music, why does one have to right click the album title and select send to device. . . wouldn't a button next to the item be easier?
While it identifies files on the portable device that are not on your PC, but I haven't found the reverse to be true.
And, worst of all, if you change the artwork for an album in SMM, it doesn't move that updated artwork to the portable device; at least it does not for the Blackberry 9650.