Strange -- I still need to go through an external powered hub. Since upgrading to Snow Leopard, though, my USB has been odd -- some external memory card readers now act strangely, etc. These used to work fine under 10.5 though! The SuperDrive, digital cameras, iPods, etc do work normally via USB under 10.6, so I'm not inclined to think that the USB port itself is defective.
Did you just do the basic soft reset? Just put a pin into the reset hole and then powered back on?
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