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Plug your phone into the computer using a USB cable. The phone should make a notification sound and options will appear in the notification bar. Choose USB mass storage.
On your computer, go to my computer and find the phone. On mine its usually drive M or drive H. Then just drag and drop the files onto the SD Card like a flash drive.
MIUI
Thanks Brad, it worked and is so easy once I followed your directions...have been downloadng all afternoon...now how do I transfer pictures from my album to my droid?:droideris: