Here are screen shots that illustrate the differences between Interlaced and CineMotion or Progressive DRC. Although the screen shots are a comparison between a progressive scan DVD player and an interlaced DVD player, the differences are similar to what you would find between CineMotion DRC and Interlaced DRC modes on your television.Progressive Scan (CineMotion is similar)
Interlaced Scan
Both images are from the beginning of chapter 29 of the movie Se7en. You will notice that the first image is a lot smoother, especially the diagonal lines of the building. This is what CineMotion DRC will do, albeit not as smoothly as a true progressive scan DVD player. CineMotion is a format between interlaced and progressive, but closer to interlaced in quality.
By the way, CineMotion will work regardless of type of connection, whether it be composite, S-Video or component.
Note: The images above were taken while the movie was playing. When comparing CineMotion DRC to Interlaced DRC, it's important to toggle back and forth between the two modes while the movie is playing. If you pause the player, you will not notice anything different.
I would suggest using CineMotion DRC for film-based material such as movies on DVD. Use Interlaced DRC for video-based material like cable or satellite TV. Use Progressive DRC for digital material and still images.