Mark Jaquith

This plugin increases the height of the category checklist meta box on the post editing screen so that all categories are shown. No more scrolling! All of your categories will be visible. If you’ve been frustrated by having to scroll to find the correct category, this plugin is for you. No options. Just install it and you’re good.

Category Checklist Expander

Increases the height of the category checklist meta box on the post editing screen so that all categories are shown.

KZeni

Fixes the wrap behavior of the WordPress admin bar when it has too many items. Keep it neat; don’t spill/overflow into the content.
Check things out on GitHub at <a href="https://github.com/KZeni/Admin-Bar-Wrap-Fix" rel="nofollow ugc">https://github.com/KZeni/Admin-Bar-Wrap-Fix</a>

Admin Bar Wrap Fix

Fixes the wrap behavior of the WordPress admin bar when it has too many items. Keep it neat; don't spill/overflow into the content.

Category Checklist Expander vs Admin Bar Wrap Fix