New in WordPress 2.9: Post Thumbnail Images « Mark on WordPress
WordPress 2.9: Post Thumbnail Images
I should try to use this feature.
add_theme_support( 'post-thumbnails' );
What if you want to use a small 50×50 hard-cropped image for the home page, but want to use a 400 pixel-wide (unlimited height) image on the post’s permalink page? You’re in luck. You can specify additional custom sizes!