ClipArt.com - Strength: the list of sites is huge.(though based on the amount of people referred)
Weakness: common clipart, mostly bullets, buttons and arrows, list is based on who sends in the most which means that finding clipart on the top sites can be tricky.
Popups? No
Directions: Click to enter, in the middle above list, it says free images, click there to see their collection.

Clip-Art.com - Strength: search feature allows you to search site descriptions which is nice, lots of sites to choose from, little graphic to indicate how many images a site has.
Weakness: too many pop ups, gauge is nice, but submitter only really knows, plus a site that claims 10,000 images might be only talking about bullets or arrows. No clipart, only links
Popups? When you enter it pops a site or poll, when you click on the next page there is a junkmail pop up and a pop up ad, when you change pages more pop ups, and when you exit it pops up
Directions: Click to enter, sites only, no content

Clipart Castle - Strength: lots of images to choose from
Weakness: common graphics, hassle to get to clipart.
Popups? no
Directions: On left hand side, click the graphic that says clipart. An agreement form comes up. At the very minimum you have to put something@something.com, and check that you agree to their terms. It will ask you if you are sure about not signing up to the junkmail lists, you can click ok. Next page, select your category from the left side.

Clip Art Center - Strength: A fair size collection of clipart and web elements, organized into many categories.
Weakness: there were some not applicable clipart in some subcategories, ie ferrets and kangaroos in the cats category.
Popups? on exiting the site it refers you to another site
Directions: Click to enter in middle, on the next page on the left hand side, it indicates main categories, pick one, in middle it will have subcategories, pick one, if you get another subcategory keep picking until you see clipart, some categories have more than others. You will now see clipart, and from there if you want to look at another section of clipart, you can use the dropdown box on the middle right and press go on the one you want.

Clipart Central - Strength: nice appearance,can find copyrighted images
Weakness: common clipart, not a huge selection at this point.
Popups? No
Directions: categories are on the left hand side, the link that says animation city, and the link that says 10,000 are links to elsewhere. The link in the middle that says click to enter the clipart site is also to elsewhere.

Clipart Fonts - Strength: list of mostly font sites
Weakness: no content, not very many sites
Popups? when you enter an ad pop up occurs, when you click to enter, it has a pop up to another ranking list.
Directions: Click to enter, sites right there

Clipart Graphics - Strength: fair number of collected clipart on site
Weakness: entry page
Popups? when you enter it appears that it pops an ad and another clipart site, when you enter it pops another site, when you exit the site.
Directions: scroll down to the bottom where it says click here to enter our site and click on the word 'enter', on the left hand side is the categories. The find anything is searches the internet not the site.

Clipart Graphics Net - Strength: has a fair number of clipart
Weakness: common clipart to a few other sites
Popups? when you leave their site
Directions: click on the dog logo to enter, scroll down about half way, on the left side is their categories, select one and you are on your way.