I thought I'd share what I've found working as a USB charger for the Nook HD+.
1) USB 3.0 ports on a computer (slower charge at 900mA)
2) Powered USB 3.0 hub (slower charge at 900mA)
3) Philips SPS8038B Relocatable Power Tap (http://www.amazon.com/Philips-Office.../dp/B00865TV2Y)
4) SPRINT CTC-2USB-5V2A car/home charger (http://www.newegg.com/Product/Produc...9SIA20211P5919)
Please add if you have any other USB chargers that work!