The Categories Images Plugin allow you to add image with category or taxonomy.
Category and Taxonomy Image Plugin allow you to add image with category/taxonomy.
A powerfull widget for displaying categories with image.
HMK Featured Images enables the user to set different featured image for each category, sub category or page.
Have featured and cover images for tags, categories and custom taxonomies
This is a basic plugin allowing users to associate category to logos.
The WP Multiple Taxonomy Images Plugin allows you to add multiple images to a term. It supports category, tags and custom taxonomies.