Animation City - Strength: lots of animations
Weakness: common animations, I don't like the frame layout as it looks very cluttery.
Popups? when you leave it pops up their ranking list
Directions: click 'enter animation city', categories are in the middle left. When you see the pictures click on one to see the large animated version.

Animation Library - Strength: search feature, original animations
Weakness: is awkward to browse.
Popups? junk mail pop up when you enter.
Directions: on the right hand side is a drop down box to allow you to select the category, in the same spot on the next page, you get another drop down box allowing you pick the animation you want to look at. You can also use the search feature, but you will have to pick the drop down box for the specific animation afterwards.

Animation Rocamagifs - Strength: fair number of animations to choose from. French and English.
Weakness: has entry page
Popups? I ran accross one instance when clicking contents on the bottom of celebrations.
Directions: click the british flag in top area of the webpage. One the next page, scroll down a bit, on the left hand side is the categories in green blocks.

Animations Only - Strength: Many animations to choose from
Weakness: common animations
Popups? No
Directions: scroll down and select an animation category from the left hand side underneath the 'animations' heading. On the next page scroll down until you see either some images, or a subcategory choice. If necessary, select a subcategory and repeat until you see the images.

Animation Station - Strength: nice selection of animations
Weakness: limited selection at this time
Popups? No
Directions: scroll down and pick a category from right above the flashing diamonds.

Anti - Reality Animations - Strength: nice animations in animals and birds
Weakness: not many images
Popups? when you click on the word animations.
Directions: click on the word 'animations' on the left hand side.

Any Best - Strength: links to clipart sites
Weakness: no content
Popups? when it enter it seems to double pop up
Directions: you will see the sites it recommends right away. No clipart on the site.

Art 100 - Strength: claims to do requests, original clipart
Weakness: ran into a lot of 404 errors, making site navigation difficult, not very much clipart in general, quality of clipart may appeal to specific audiences, a little birdie told us that they do not follow through with requests.
Popups? No
Directions: go down to where it says images, select in the drop down box the category. If you hit a 404 error try another category. The dropdown box works better than the links below it.