adding a logo to the credit's reel

Create your logo over a transparent background in Photoshop & save as a png format. Import to iMovie & drag over the clip you want the logo over as a Pip effect.( see the the tutorial about how to do a Pip if you don't know how.) I don't know why it works it just does. I tried making logos over green, then trying the green screen effect but it never works as a still. I happened on the transparent .png
by accident. You also want it to scroll with text?, I don't know, one thing at a time, how about a single page the quickly fades in & out? That would be easy.

if you want a scrolling logo, Aaron has a very smart way to accomplish this:
http://www.unlockingimovie.com/2009/02/how-to-add-image-to-scrolling-credits.htm l