This is an easy way to rename pictures at the same time. It saves you a lot of time. If you, for example, want to call all your pictures “Christmas 2011”, do the following:
Step 1. Select the photos you want to rename.
Step 2. Click with the right mouse botton on the first picture when you have selected all the pictures you want to rename.
Step 3. Write “Christmas 2011” or whatever you want to call your pictures.
Step 4. Click “Enter”.
Now you can see that every picture has “Christmas 2011 (1).jpg”, “Christmas 2011 (2).jpg”, “Christmas 2011 (3).jpg” etc on it.