USB ports and hubs

We've had conversations about using USB devices...

Someone in our (Ustream.tv) chat room suggested we review "USB Hub Design and Windows".

Per the USB Implementers Forum, the specification for cable lengths is 3 meters to 5 meters.

I have used longer cables, but only for devices that do not need to be powered by the USB port. And, I have USB devices that cannot be powered by certain computer ports because the ports do not provide enough power for the device: because of bad experiences I do not trust USB devices that use Y-cables.

When considering using powered hubs, keep in mind that what is considered to be a "compliant bus powered hub" has only four ports.