Line Up Objects on Your PowerPoint 2007 Slide
Lining up objects on a PowerPoint slide gives your presentation polish. The PowerPoint Drawing Tools tab enables you to line up your PowerPoint objects. To align your object, click the Drawing Tools tab and click the Align button.
The following options are available.
The first three commands align items horizontally; the last three align items vertically.
You can also distribute several items so that they are spaced evenly. Select the items that you want to distribute, click the Draw button, choose Align or Distribute, and then choose Distribute Horizontally or Distribute Vertically. PowerPoint then adjusts the spacing of the objects that appear between the two outermost objects selected.