If you are using PowerPoint 2007, there is a built-in Cloud shape in Basic
Shapes section. The one with trailing bubbles is in the Callout section.
If you are using a previous version of PowerPoint, you can follow these
steps:
1. Insert the could shape with trailing bubbles from the Callout section.
2. Right-click the shape and select "Save as Picture..." menu item.
3. Save the picture with .emf as the "Save as type".
4. In PowerPoint, select "Insert" | "Picture" | "From File..." menu item.
5. Locate and select your saved .emf picture and click OK.
6. Right-click the shape and select "Grouping" | "Ungroup" menu item.
7. You may be asked to convert the shape to Microsoft drawing - click Yes.
8. Again right-click the shape and select "Grouping" | "Ungroup" menu item.
9. Now you can delete the trailing bubbles and regroup the remaining shapes
to get your cloud.
- Chirag
PowerShow - View multiple PowerPoint slide shows simultaneously
http://officeone.mvps.org/powershow/powershow.html