Simply shows the ID of Posts, Pages, Media, Links, Categories, Tags and Users in the admin tables for easy access.
Maybe not the latest super trick plugin - but it still does what it says it will do, even if it hasn't been updated in years. Why fix it if it isn't broken. Who gave it three stars?
Activate this plugin, or cull together scraps of code from across the internet? There's no contest. This plugin does the job perfectly, even for custom taxonomies.
Simple, lightweight and very handy.
Please update the readme to confirm WP 4.0 compatibility. As it's not been updated for over 2 years it currently won't be showing for most searches in the WP.org repository.