Silicon Chip Online - The Itsy-Bitsy USB Lamp:
"Parts List - USB Lamp
1 USB male plug moulded to suitable length 4-way screened cable
1 Ultrabright White LED (preferably at least 2000mCd) (eg, DSE Z-3980, 3981, 3982, etc)
1 3AG in-line 2-part plastic fuseholder (eg, DSE P-7912, Jaycar SZ-2015, etc).
1 47Ω 1/4W or 1/8W resistor
Lengths of thin diameter heatshrink (preferably) or spaghetti insulation"