I have(had) two powered USB hubs. A kensington and a rosewill. both are on the fritz. went at the same time. the rosewill fell and something cracked inside, and the kensington no longer provides power even when it's plugged in. So they are both getting chucked. I need a new one for my iMac. Not sure if PC/Mac matters at all with USB hubs, but just wanted to ask anyway for suggestions on what people are using. Must be powered, like I said, and if it's got a heavy base so it'll stay put that's a good thing too. thanks!