I am going on a vacation in a few weeks, and the Missus doesn't want me to bring a laptop ( or a desktop! ) on the cruise. I thought I would just use a powered U.S.B. hub to charge up my Zunes, the 2 Sansa MP3 players, and the wifes' generic player. Imagine my surprise when I tried it with an A/C powered 7 port Belkin hub and they didn't charge a bit. Anyone have any ideas? Would a different brand of hub make a difference?