How do you transfer files from one SD card to another?

Well, if it's a Micro or a Mini SD card then you're gonna need an adapter for it, they should come packaged with one. If it's micro or mini, put it into your adapter, then depending on what kind of adapter you have (USB or SD Card) you need to put it in the USB port or the SD Card port. But if you have a normal SD Card, just plug it into the SD Card port on you computer, most computers have them (even laptops). Now that you have it connected, a window might come up depending on your settings, it will ask you what you want to do with the memory card, just scroll down until you find the option that says something like this: Open files in a folder. Or you could just look for the folder icon. Then you just drag and drop the things that you want inside the memory card. But if the window that asks you what you want to do doesn't pop up, then here's what you need to do. Click the start button at the bottom left corner of your screen, then click on the My Computer button (it will just be called "Computer" if you're on Vista) located on the left of the start bar (if you have XP or Vista). Now you double-click the "Removable Disk" button. This will navigate you to your memory card, then you just drag and drop the things you want inside that folder. I hope I helped. :D