Gograph  http://www.gograph.com/ 
At Gograph one can search by keyword or subject for the picture they need.  Most of the clip art moves or has a neat effect.  The objects are easy to download, but one must enter some generic information into a form beforehand.  Other options include searching through feature artist pictures and sending a picture to a friend.

AAA Clip Art  http://www.aaaclipart.com/ 
Triple A Clip art is a  site with capability.  If you want to do a simple search, you will find basically what you need.  If you are willing to buy membership then you will have more of a variety to chose from. It really isn't necessary though.  You can search by keyword or subject and find pages of clip art for free.
 

Animation Factory  http://www.animfactory.com/?AID=15997&PID=155640
If you are looking for free animated graphics, then animation Factory is just the place to visit. They have thousands of free graphics.  You can search by subject area or key word. They have new feature animated graphics, as well as holiday features.  Of course you can purchase a membership for extras.

#1  Free Clip Art  http://www.1clipart.com/index.cfm
Over ten thousand images in three hundred categories!!!  This site is extremely easy to find exactly what you need.   Just select a category then browse for what you need.  There isn't a search by keyword option, so it does take some navigating if you are in search of something specific.

Clip Art Connection http://www.clipartconnection.com/  
This site offers a variety of clip art items  You can search by subject area.  Holiday clip art are great. Search through the animated graphics or go to another linked site for graphics.   If you are looking for a new font then you can also find mac and pc fonts here.