Click to these links in order to find out how the impact factors are defined as well as to see the impact factors holding for the previous years
http://www.ekt.gr
http://www.oocities.org/iipopescu/Jo_rankingb.htm
http://perso.club-internet.fr/simongrg/impactfactor2002.htm
http://www.library.auckland.ac.nz/subjects/comp/JIFCS.htm