Finally USB is supported on Sansa Clip+. Now my Clip+ is complete .
3.3 USB ChargingTo charge your player over USB, hold any button while plugging it in. This will prevent it from connecting to your computer and let you continue to use it normally. Your player must already be in Rockbox for this to function.Note: Be aware that this button may still perform its normal function, so it is recommended to use a button without harmful side effects, such as Select.
I cannot get USB mode to work on my Clip+. Win7 tries to install a device driver (USB Mass Storage Device) upon connection, but fails. The device does not get mounted at all.EDIT: I suck, I had to disconnect and reconnect it, the second time it worked.