Quote (RecoveryChannel @ Oct 8 2010 02:06pm)
PS: As you can see, my biggest problem was to focus correctly. In these 2 shots, only the back of the cars are really in focus, the front is blurry. I didnt find out how to prevent that yet, but I sure will soon

I guess it alos has to do with the position you´re shooting from, and the perspective.
Anyway, I´ll be trying out that shit alot more in future and hopefully I can bring it to my utmost possibilities. feel free to post your attempts of panning shots in here aswell, wether they´re good or bad. Let´s just share and talk about it in here.
Regards
Not just from the quoted one, but they all look quite interesting.
You mention it being hard to focus on the right object, but really, the easiest thing to do is to just shoot at a slightly tighter aperture, sorts out your focusing issues.
The whole point is objects in the background appear blurred because you're moving the camera, not because you're shooting at a shallow DoF.
Remember, KISS (Keep It Simple, Stupid).