Simple plugin to set the featured image size to a wordpress media size by default. Handy if your authors forget to set this on upload.
NOTE: You will need to edit a php file to get this plugin to work. If you are not comfortable editing php files, please consult a developer. No free support is offered for this plugin.
To use:
Download the zip file
Open the featured-image-resizer.php file in a text editor.
edit line 25, changing 'featured-iamge' with your wordpress media size.
save and upload the plugin
Activate the plugin.