I still highly enjoy Cream, Pink Floyd and The Doors, but Led Zeppelin have always been boring to me.
Believe it or not, my favorite would probably be Led Zeppelin IV. As indifferent as I am to Zeppelin, I really enjoy Rock n' Roll, Goin' to California, and Misty Mountain Top. Those songs, plus the Song Remains the Same, The Rain Song and All of my Love, probably form the Zeppelin songs I really enjoy.
And I actually like Stairway to Heaven..