If the moving backgrounds are through animated GIF files, then you can have
normal PowerPoint shapes and text over it. If the moving background are
movie files (like wmv, mpeg, etc.), the VBA TextBox control can be over it
but then it is not transparent and has a solid background color. An
alternative in this case is to run movies standalone and run transparent
slide show over it. This solution is explained using two presentations - one
over the other - at:
http://officeone.mvps.org/powershow/tips_text_over_video.html

- Chirag

 Shortcut Manager - Assign keyboard shortcuts to menu items and macros
 http://officeone.mvps.org/ppsctmgr/ppsctmgr.html