Photoshop collage

Remember to pay attention to the size of the images you are using:
(in the pull-down menus) Image - Image Size... to make adjustments

Make selections using these tools:
magic wand
various losso tools

Clean up your selection using the "add to selection" or "subtract from selection" options that are available in the upper left part of you control panel with the various selection tools.

Then feather your selection using a quick mask:
hit "Q" on your keyboard to enter quickmask mode
(in the pull-down menus) filter - blur - gaussian blur... to control your feather.

Save your selection by using the "select" pull-down menu:
"save selction"
"load selection"
(they will be stored in your "channels" palette

To scale or distort your image, use the "edit" pull-down menu:
edit - transform - scale, rotate, distort, etc.

Use your "move tool" to move objects.

Remember to keep each object on a different layer!

What can happen to photos on the internet?

Shepard Fairy's Obama poster debate.(look it up!)
Photosynth.(see links list on sidebar)
Virgin Mobile Flickr fiasco.
Definition of fair use.