Allows you to add custom widget content on a post-by-post (or page) basis from the post editor screen.
The My Snippets plugin displays custom snippets in the widget area of your choosing on a post-by-post basis. It allows you to easily display contextual content.
While the plugin is both simple and powerful, it'll never replace such plugins as Widget Logic and Widget Context nor is that the plan. What it does is allow you to add custom widget content from the Write Post/Page screen without having to go to your Widgets screen in the admin.