Admin plug-ins

http://rudd-o.com/projects/wp-admin-themer/

http://codex.wordpress.org/Creating_Admin_Themes

http://wordpress.org/extend/plugins/adminimize/

http://wordpress.org/extend/plugins/easy-admin-color-schemes/

WordPress

http://www.binarymoon.co.uk/projects/bm-custom-login/
http://www.wprecipes.com/how-to-disable-the-please-update-now-message-in-wp-dashboard
http://codex.wordpress.org/Administration_Over_SSL
http://www.problogdesign.com/wordpress/custom-wordpress-login-screen/
http://wordpress.org/extend/plugins/bm-custom-login/
http://weblogtoolscollection.com/archives/2007/12/28/9-wordpress-admin-themes/

Safely modify your WordPress admin’s CSS and make it futureproof

Git GUI

Overview of GIT GUI clients:
http://theappleblog.com/2009/03/10/using-git-with-os-x-6-tools-to-get-you-up-and-running/

Search engines

A good article about different search engines.

http://www.makeuseof.com/tag/5-advanced-search-engines-web/