Timeouts in AppleUSBEHCI - how can I find out what is causing this?
Generate a system report (in Lion: About this Mac-> More Info -> System Report, or do a Spotlight search for System Information if you allow Spotlight to index applications.)

Click on USB; then look for the bus ID mentioned. Under that bus, look through the Location IDs of each device; this field is "Addr" in the error logs. Note that location IDs are unique only across a bus, not the entire system.

Once you've identified the device, I would try swapping it to a new port, either with another device on the hub or to a blank port on said hub.  If the errors stay with the device and not the port, my next step would be to plug the device into a direct port or swap cables.  If you still have issues with the device, look for firmware updates to the device.

If after troubleshooting the hub is suspect - note that some people have found the power adapters that ship with some cheap USB hubs to be very poor, not capable of delivering anywhere near enough current.  http://hackaday.com/2012/01/06/running-the-numbers-on-a-cheap-psu/

I would put the phone and garmin charger directly off the Mac's USB ports; among other things, your mac can supply twice as much current to your phone for charging.  See https://support.apple.com/kb/ht4049