I got one of these docks:
Amazon.com: GSI Super Quality Desktop 3-In-1 Rapid Charger/Cradle/Data-Sync Docking Station For HTC AT&t Aria Droid Cell Phone - Plus Slot For Extra Battery Charge - Powered By USB Or By Included AC Wall Adapter: Cell Phones & Accessories
It is incredibly slow to charge. If I'm streaming internet radio, it barely keeps even with the charge. If I stream radio, and use bluetooth for a speaker, it may even fall behind while it's plugged in.
I have it plugged into a wall charger, not a PC usb port.
It's so much slower than any other charge I have.