Quick Reply Template Plugin allows you to automatically set the text of a quick comment reply feature introduced in Wordpress 2.7. For example if your reply template is: %FIRST_NAME%, — and the comment authors name is: Paul William — Then the default text in a reply would be: Paul.

Remove Stopwords From Slug removes the stopwords from the URLs for better SEO optimization of your blog and for making better and smaller URLs. You can set the stopwords through the `Plugins’ menu in WordPress wp-admin.

WP Smush.it offers an API that performsYahoo's image optimizing tips from Exceptional Performance series: “stripping meta data from JPEGs; optimizing JPEG compression; converting certain GIFs to indexed PNGs; stripping the un-used colours from indexed images” — (except for stripping JPEG meta data) automatically, and this plugin seamlessly integrates Smush.it with WordPress.

Theme Tweaker picks out the existing colors from your current theme, displays them, and gives you a color picker to replace them. It gives you some shortcuts to change them en-masse, like invert all colors (go negative) or go greyscale.