ExpressionEngine Add-ons
Usability Accessory
An ExpressionEngine accessory which adds clarity to text input and textarea fields in the control panel (excluding the publish form) and makes a few other CSS adjustments. Tweaks include a higher contrast, monospaced font, wider input fields, cursor adjustments for clickable and draggable elements, and a tweak to restore drag handles on custom fields in publish layouts view when NSM Morphine Theme is installed.
UPDATE: Now that ExpressionEngine includes override.css I recommend adding this CSS to themes/cp_themes/my_theme/css/override.css file. It works great in conjunction with the Nerdery CP Theme which is a nice, minimal override.
Last Updated Plugin
A simple plugin that returns the edit date of the most recently updated template or channel entry. Accepts EE date variable formatting. For example...
{exp:last_updated format="%F %d, %Y"}
...would return something like "November 28, 2010" (or some other date).