Date: 12/3/2008 1:42 pm EDT
Shawn, Journeyman is correct, The beauty of ceramic tile is sometimes in the imperfections. But if you have an area that may have some misalignment and you want to tap them back into place without disrupting the alignment of the tile that are straight try inserting a standard 1/4" tile spacer in the tiles that you don't want to move before you tap the other tiles in place. The spacers will ensure the alignment stays in place while moving the others.
Good luck. let me know if this helps.