Yes, the easiest way to copy a miniDV tape is to connect to MiniDV camera with another miniDV camera.
Use a the "4 pin iee1394" as DocNo said, do NOT use the RCA cables, or Svideo.
Now if you don't have a second camera, or the cable that has 4 pins on both sides, you can capture it to your hard drive and copy it back to a different tape. MiniDV is pretty compressed compared to regular DV, so expect about 3.5 megs of data per second of tape.
So expect about 13 gigs for an hour of footage.
Now if you don't have any video editing, you can use a free program to do this.
DVIO or
WinDV (I've never used WinDV, but it looks fancier than DVIO)
Also, for general video information, checkout
VideoHelp.com .