Remkus de Vries
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Nice round up of what can be done with just the default featured image feature. One extra tip: you can also set the width of your content area as a featured image and define that same width in Settings > Media. This way you can select a featured image to use in your theme and it will be automatically the maximum size of the content area.
Also great having those values in there for <a href="http://codex.wordpress.org/Embeds">oEmbed</a>.
3 years, 6 months ago on How to Create Additional Image Sizes in WordPress