Yo paperman!

I should check this forum more often... basically, it all depends on what software you want to use, as each will have it's own special effects for accomplishing this.

After determining which one you want to use, or are already using, check the fastest growing library of how-to's on the net, YouTube!

for instance:
Sony Vegas Studio
http:// www. youtube .com/watch?v=7Yw1WmxXSZ8

Adobe After Effects
http:// www. youtube .com/watch?v=E20f8PDi9VE

And there are many many many more.