Mark Jaquith

<p>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.</p>


Category Checklist Expander

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

inuyaksa

<p>With this plugin you can add nicescroll to your WordPress site.</p>


WP-Nicescroll

Add nicescroll to your wordpress site, it's a jquery (since 1.5) plugin for nice scrollbars with a very similar ios/mobile style.

Category Checklist Expander vs WP-Nicescroll