水野史土

This plugin shows post/page/category/tag/comment/media/user IDs on admin’s edit post/page/category/tag/comment/media/user pages. You can see the ID when you visit an edit post/page/category/tag/comment/media/user page. 
Since this plugin hooks on ‘edit’ link, only users with priviledges can see IDs. For example, a user of author role can see post IDs, while a user of subscriber role cannot.
You can find a brief description in Japanese on a book <a href="https://php4wordpress.calculator.jp/" rel="nofollow ugc">Introduction to PHP for WordPress Users.</a> (written in Japanese.)

ShowID for Post/Page/Category/Tag/Comment

This plugin shows post/page/category/tag/comment/media/user IDs on admin's edit post/page/category/tag/comment/media/user pages.

wpseek

With WordPress 2.5 being released, the IDs on all admin pages have been removed as it is. Propably due to the fact that the common user dont need them. However, for advanced WordPress Users/ developers those IDs were quite interesting for some plugins or template tags.
What this plugin does is to reveal most removed entry IDs on admin pages, showing the entry IDs, as it was in versions prior to 2.5
Features:
<ul>
<li>Sortable columns for WP 3.1 or higher</li>
</ul>
<a href="https://twitter.com/wpseek" title="Developer on Twitter" rel="nofollow ugc">Developer on Twitter</a>
Included languages:
<ul>
<li>English</li>
<li>German (de_DE) (Thanks to me ;-))</li>
<li>Brazilian Portuguese (pt_BR) (Thanks for contributing brazilian portuguese language goes to <a href="https://www.maujor.com" rel="nofollow ugc">Maurício Samy Silva</a>)</li>
<li>Italian (it_IT) (Thanks for contributing italian language goes to Gianluca Urgese)</li>
<li>Spanish (es_ES) (Thanks for contributing spanish language goes to <a href="https://www.es-xchange.com" rel="nofollow ugc">Karin Sequen</a>)</li>
<li>Russian (ru_RU) (Thanks for contributing russian language goes to <a href="https://grugl.me" rel="nofollow ugc">Dimitry German</a>)</li>
<li>Belorussian (by_BY) (Thanks for contributing belorussian language goes to <a href="https://www.fatcow.com" rel="nofollow ugc">FatCow</a>)</li>
<li>Dutch (nl_NL) (Thanks for contributing dutch language goes to <a href="https://wpwebshop.com/premium-wordpress-plugins/" rel="nofollow ugc">wpwebshop.com</a>)</li>
<li>European Portuguese (pt_PT) (Thanks for contributing european portuguese language goes to <a href="https://thepatientcapacitor.com/" rel="nofollow ugc">PL Monteiro</a>)</li>
<li>Polish (pl_PL) (Thanks for contributing polish language goes to Simivar)</li>
<li>Romanian (ro_RO) (Thanks for contributing romanian language goes to <a href="https://www.jibo.ro" rel="nofollow ugc">Anunturi Jibo</a>)</li>
<li>Georgian (ge_KA) (Thanks for contributing georgian language goes to <a href="https://www.onlinecasinobluebook.com/" rel="nofollow ugc">Online Casino Bluebook</a>)</li>
<li>Swedish (sv_SE) (Thanks for contributing swedish language goes to <a href="https://fjellner.com/" rel="nofollow ugc">Tor-Bjorn Fjellner</a>)</li>
<li>Ukrainian (uk) (Thanks for contributing ukrainian language goes to <a href="https://www.everycloudtech.com/" rel="nofollow ugc">Everycloud</a>)</li>
</ul>
Looking for more WordPress plugins? Visit <a href="https://www.schloebe.de/portfolio/" rel="nofollow ugc">www.schloebe.de/portfolio/</a>

Reveal IDs

Thank you for developing this. I have greatly enjoyed using it. 

Great, Simple, Plugin!

What this plugin does is to reveal most removed IDs on admin pages, as it was in versions prior to 2.5.

ShowID for Post/Page/Category/Tag/Comment vs Reveal IDs