You can move pics from internal memory to the memory card on the BlackBerry itself, without the need to connect to a pc. Highlight a pic in the internal memory, then use the menu key to select "Move" and navigate to the memory card's Pictures folder. Then choose "Move Into" when that folder is selected. You have to go picture-by-picture - no multiple moves at once - but it works.
My Bold also mounted two drives to my computer. Both the memory card and the BlackBerry itself showed up as two separate mounted hard drives. My Tour only mounts the memory card. I've tried it with all different variations of memory settings and with the password both on and off. It's a mystery to me why the BB itself doesn't show up. I'm a Mac user by the way.