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The “One post widget” can be installed and activated in 4 easy steps:
1. Unzip "one-post-widget" archive and upload extracted folder named "one-post-widget" into your "plugins" folder (/wp-content/plugins/)
2. Activate the plugin under "Plugins" menu in admin area by clicking on "Activate" for the "One post widget" plugin.
3. Add "One post widget" widget into sidebar in themes menu, add options and you are set.
4. Now sidebar on public side should show your selected content
Screenshots
Widgets added to sidebar with options (WP 3.3)
Sidebar showing that contents selected to show in widget admin (WP 3.3)