WordPress.org

Do I need to link to clker.com?

No. A link would be appreciated but it is up to you.

Can I use your images for commercial purposes

The clip art images are believed to be in public domain. Users who directly shared their images dedicated it to public domain. Other pictures were collected by us from different internet resources that labelled them public domain. You can use them as you wish and as allowed by the laws of your state or country.

Do I have to attribute you?

No.

Where can I request features or report bugs?

The best place is my weblog at the plugin's page http://www.clker.com/blog . I do not make any promises with regards to adding features, or fixing bugs. It all depends on how much spare time I have, but I'll do my best to look into it.