The show should be renamed Metropolis as a lot of the action happens there and not in Smallville. A few highlights: the appearance of the Legion of Super Heroes (from the comics) and the Jimmy Olsen - Chloe- Davis Bloome (a.k.a. Doomsday) love triangle which reaches a tragic conclusion for two of the three mentioned in the final episode of the season. Also, the end of the Clark and Lana love affair (she gets superpowers and literally becomes kryptonite to him). And the beginning of the Lois and Clark love affair.
Look for the great effects and storylines to continue in Season 9 with appearances by the Wonder Twins (yes, alien teenagers with superpowers from the Superfriends cartoon show) and the Justice Society (Hawkman, Dr. Fate and Stargirl). And lets not forget Bryan Austin Greene as that man with a green glowing rock for a heart, Metallo. And Zod, in the flesh.