I'm quite pleased with my Kensington USB dome hub -- it's solid and very accessible. The only downside is the power supply -- it means yet another cable. I was a bit disappointed that Kensington didn't take power from the Mac's firewire port.
That's the neat part of the Belkin USB 2.0& Firewire 6-Port Hub For Mac Mini. Power comes form the Firewire. It consumes one Firewire port (on the Mac) and provides two on the hub, so net 1. That's nice, but it's really a USB hub powered by firewire. Great -- I wish more vendors did this.
There are two problems. The Mac connector cables are very short -- it's really designed for the Mac mini and one Amazon reviewer claimed the cables were too short for his Intel Mini. Also, the USB ports are mostly in back of the device, I'd rather have more in front.
Worth keeping in mind.