The 2006 Topps Pre-Production release contained only 3 cards (I.Suzuki, A.Rodriguez, A.Pujols), and contained nearly identical photographs as the Topps base set. During the 1990's, the Pre-Production sets often contained 9 cards with variation poses. Regardless, I continue to integrate the Pre-Production cards with my base sets along with the Traded/Update sets as shown below. Actually, the Pre-Production cards appear to be less "touched-up" than the base cards, which have always appeared to look dark to me in the 2006 set. As always, the card backs for the Pre-Production vary a little from the base cards. It's hard to believe that it's been over 10 years since the release of the 2006 Topps set.