Rick:
As always James hands out good advice.
I would add just two things.
1. Most photo editing software will allow you to batch-add things like contact info, keywords and captions. Doing many images in one automated (once you've done the set-up) is a great task to hand over to your computer.
2. If you have a lot of images that need metadata, keywords, captions etc I'd recommend that you look at something like PhotoMechanic. Very fast and easy to work with. I use it for captioning and adding metadata to my images.
Mike Karlsson
PhotoSource International
www.photosource.com
mike@photosource.com