Here is the current CBA (Christian Booksellers Association) bestselling bible translations list, according to unit sales, for January 2008:

1 New International Version
2 New King James Version
3 King James Version
4 English Standard Version
5 New Living Translation
6 Holman Christian Standard Bible
7 New American Standard Bible
8 The Message Eugene Peterson
9 Today’s New International Version
10 Reina Valera 1960 (Spanish)