Well, I have many little USB gadgets for my C3000 so let me share some of my experiences.
USB mini LAN adaptors work with the Z. The USB port on the Z provides sufficient power for it.
USB Bluetooth dongle also works. (well at least the little one I have)
USB mini mouse (mine is very small) also works
USB mini keyboard works as well
MP3 player's USB disk and USB memory sticks are OK
1.8" works if the Z is plugged in but not if its not plugged in to the mains
2.5" need a powered hub, but you can have multiple 2.5" plugged into the hub
3.5" have external power supply so no drama
plugging 4 USB devices into a powered hub works fine, but does not work if the hub is unpowered
USB light needs a powered hub, in fact, it does not need the Z, just the hub
USB camera needs the powered hub
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I'm looking for USB hub which has its own internal power(Li-Ion bat). Is this kind of product available in the market?