Here are a couple of sites worth checking out ....

Setup Field. Great place to get some much improved setups for all of the cars available in LFS
http://setupfield.teaminferno.hu/


Organized Racing where you earn, gain licensing - kind of like iRacing or Race2play but for LFS. You can race with as little as the demo or the full S1 and S2 versions
http://www.raceauthority.com/