Clip art

free clip art sites are HARD to find overall.
I won't use this for resale as I think that would be theft. But for personal use... not a problem.

Here's one Edigg.clipart.

Clipart ETC
Welcome to quality educational clipart. Every item comes with a choice of image size and format as well as complete source information for proper citations in school projects. No advertisement-filled pages with pop-up windows or inappropriate links here. A friendly license allows teachers and students to use up to 50 educational clipart items in a single, non-commercial project without further permission.
Lee hansen Graphics. Looks to be all free clipart/graphics.
Lee Hansen's free clip art includes many downloadable graphics for today's most popular themes, styles and crafts. You'll find free hundreds of clip art graphics for holidays from New Year to Hanukkah.

Our collection of exclusive, original graphics includes clip art for parties and celebrations, hard to find images for popular themes like pirates, vacation in paradise and fairies, plus dozens of clip art borders, buttons and scrapbook embellishments for page layouts and making your own gift tags, labels and greeting cards.

Philip Martin Clip-art.

I'll add more as I find them. Let me know if you know of any.