All Clip Art Site - Strength: lots of categories
Weakness: clipart common with a few other sites
Popups? When you select the categories.
Directions: click 'enter here', on left hand side is categories. Once inside the categories, you may want to click gallery link instead to avoid pop ups.

All Free Art - Strength: nice selection of images, lots of icons with some animations and clipart mixed in.
Weakness: some common clipart
Popups? on entering there is a pop up, when you leave the main page to a category or leave the site as well
Directions: the categories are on the left hand side

All Free Icons - Strength: lots and lots of icons, easy to find and well categorized.
Weakness: keep in mind these are icons, not actual clipart.
Popups? junk mail pop up when you enter, when you leave the site it goes to another site.
Directions: categories on the right hand side, and switch to left when in categories.

All Top 100 - Strength: Links to clipart sites with big 120x60 buttons.
Weakness: Based on how many people come from the sites involved, no content.
Popups? No
Directions: sites are right there in the middle

Amazing Animations - Strength: lots of animations to choose from
Weakness: appear to be collected from around the internet, so common animations with many other sites
Popups? when you leave the site
Directions: the categories are on the left side

Amazing Clipart - Strength: available in 3 sizes, fair collection
Weakness: common clipart
Popups? no
Directions: click to enter, categories are on left hand side

Animation Central - Strength: lots of animations, nice format
Weakness: pop ups, big jargon for webmasters recommending pop ups.
Popups? When you leave the site, and when you select the categories
Directions: categories on the left hand side