This is really starting to bug me! The lines, all of them just break up, also on the cars. Dont know how to solve this!

Please take a look!

http://rapidshare.de/files/7635115/1.avi.html

Is it my graphic card, my PC or just LFS?

ATI x600 256DDR
Intel 3,0
512 DDR

Yes, the white lines.

Also on the horizon you can see how the graphic "shakes", the grass shakes, even the colors on some cars in the replays shake (little, but I can see it being very "nervous").

This only happens using the "shift+U" option in the replay section.

Sorry, but i can't see anything wrong with how LFS looked there.

I think this is to do with anti aliasing. lfs does not use it but I think you can force it on via your graphics card's control panel.

But it could slow down video capture.