Change the post format on all posts in one category. Useful when you switch from styling "Asides" based on category to the new post formats.
Set Aside lets you change the post format on all posts in a category. This should come in useful e.g. when you used to run a theme that styles posts as "Asides" based on categories, and then you switch to a theme that styles them based on the post format, a feature which was introduced in WordPress 3.1