One of these is the circle text generator, which you can use to make text curve. Once you've created WordArt, you'll notice a new tab on the ribbon labeled "Format." That's where you can add ...

PowerPoint 2007 has WordArt tools that let you generate text not only in a half-circle, but in all sorts of rings, waves, slants and fades so you can morph your words into whatever shape you envision.