This is true, the liger really is the biggest of the big cats.
Also, like most hybrids, they are born sterile so it really would be the last of the line...
http://www.google.co.uk/imgres?imgu...a=X&ei=Q6-oTbW_K4SzhAfa3-zECQ&ved=0CDQQ9QEwAQ
Actually, according to Wikipedia anyway, there are second generation hybrids from a Tiger and Tigon called a Litigon and a Titigon depending on which is the male and which is the female. No wiki page for it but it is mentioned under the Tigon wiki page.