I have made 3 tests in order to get 3D video clips.
First, I used two parallel camcorders (Hi8 SONY TRV70E and miniDV SONY TRV900E). I zoomed picture on TRV900E in order to get the same size of the picture on both camcorder's side screens.
When importing both clips to the PC I had to re-scale and accordingly crop the picture from TRV70E (magnifying it by factor 1.22) and sync both clips. The result is shown here (cross-viewing, 50fps) and here (cross-viewing, 25fps: slow-motion). Even though the picture from TRV70E (left) is of far ahead lower quality than from TRV900E (right), I am still quite impressed with 3D effect (this was my first 3D video clip).
Second, I tried a setup (image splitter) developed by Steve Boddy. The result is given here (cross-viewing).
Third, I tried simplified setup as in the previous case, except that I have used only two mirrors (slightly folded as in the previous case). The result is given here (cross-viewing).
Three other clips using only two mirrors (last two clips are progressive 12.5fps) with 60mm stereo base: clip1, clip2, clip3 (cross-viewing: right image on the left side).
There are some other clips at sync page.