Use word Art. Here is a tut on how to do it.
http://www.microsoft.com/education/tipspecialeffect.mspx
Apply Vertical WordArt to text
1. Insert a new piece of WordArt into your document. To do this, on the Insert menu, click Picture, and then click WordArt.
2. Select a vertical layout from the five choices on the right, and then click OK.
3. Type the bullet that you would like to appear vertically. Select the font that you would like to use, and then click OK.
4. If you want to drag your vertical WordArt anywhere on the page, you need to turn on bullet wrapping from the WordArt toolbar. Try Square or In Front of bullet. (If the WordArt toolbar is not visible when you click your new WordArt, select Toolbars, and then WordArt from the View menu.)