Not enough USB Ports for non-hub-friendly Peripherals

Several of my USB 2.0 devices require being plugged directly into the computer and aren't hub friendly. Unfortunately there are more of these type devices than there are USB ports.
Solution?
I have an iMac8,1 Intel Core 2 Duo  2.8 GHz  4 GB

Are you using a powered hub?
I have never heard of that problem before.

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