Some links of setup guides collected around

ENGLISH:
Camber, Caster and Toe: What Do They Mean?
http://www.advancedracing.com/chassissetup.php

An Explanation of Camber
http://www.mgf.ultimatemg.com/group2/suspension/suspension_images/camber.htm

Basic Setup Guide LFS
http://en.lfsmanual.net/wiki/Basic_Setup_Guide

Flying Pig Pedia
http://flyingpigpedia.wetpaint.com/

Car Setup and Troubleshooting Guide
http://www.wtrscca.org/tech.htm

The "ULTIMATE" Racing Car Chassis Setup Guide and Tutorial.
http://www.racelinecentral.com/RacingSetupGuide.html

GTR2_Guide_Setup_LmS_0.62b_MULTILANGUAGE.zip
http://www.simleague.net/forum/attachment.php?attachmentid=3321&d=1221724261

High Performance Driver Tutoring
http://www.race2play.com/group/hpdt

R2P Articles and Knowledge Base
http://www.race2play.com/forum/articles

the ultimate guide to advanced driving techniques
http://www.drivingfast.net/

ITALIAN:
GUIDA PRATICA AI SETUP di Luca Varani
http://www.gpfun.net/public/?p=downloads/articles/setup/setup.htm

Flying Pig Pedia
http://flyingpigpedia.wetpaint.com/