yes in photoshop im wondering what its called when i see people taking faces and applying them to anothers body...and if there are any tutorials or books i could purchase that go more into detail on how its done

HOW TO CHEAT IN PHOTOSHOP CS(whatever version you are using)  by Caplin.  

Head Switching is the general thought of what you're describing - even though you only mention the face specifically.

There are any number of books and places you can learn to do this well - I'd start with:

I've Got a Human in My Throat
http://www.amazon.com/Ive-Got-Human-Throat-Delusions/dp/1598630709/ref=sr_1_1?ie=UTF8&s=books&qid=1242385418&sr=1-1

There should be a link to "When Pancakes Go Bad" and Surreal Digital Photography" below as the "up-sell" Amazon always goes for.

For general Photoshop knowledge and advanced training:

www.photoshopuser.com

Yes, I pimp this location big time - almost as though I own stock or something - but it's worth it. If you can afford it, get yourself a membership ($99 a year), which will get you a subscription to the magazine as well, and you will have so many tutorials available to you it'll make your head spin.

Any area in Photoshop you wanna learn, you will.

Hope this helps-
-Lew

I recently took a class with Suzette Allen www.suzetteallen.com
She has over 60 Photoshop tutorials posted on Smart Shooter.  You have to register (free) to see them.  One is called Headswaps - the family portrait perfector and gives step-by-step instructions.  www.shootsmarter.com

She also has some tutorials posted on YouTube.  www.youtube.com/results

It's sometimes called "doctoring" or a "doctored" image.

Merriam-Webster OnLine dictionary definition of "doctoring" as appropriate to your question = to adapt or modify for a desired end by alteration or special treatment

The Photoshop surgical tools for doctoring are "Cut" and "Paste". LOL. Have fun.