http://sixrevisions.com/tutorials/photoshop-tutorials/create-a-realistic-space-scene-from-scratch-with-photoshop/
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
Photoshop tools
http://graphicalerts.com/33-best-typography-effect-photoshop-tutorials-3d-text/
Getting started with wordpress
http://lifehacker.com/5365600/the-beginners-guide-to-tricking-out-your-wordpress-blog
404 pages
http://www.wpbeginner.com/showcase/best-of-best-wordpress-404-error-page-designs/
WordPress optimizing
CSS zipping and concatenating
http://wordpress.org/extend/plugins/wp-css/
Cache optimization:
http://wordpress.org/extend/plugins/wp-super-cache/
Database cleanup:
http://yoast.com/wordpress/optimize-db/
Multi-level menu navigation
http://devsnippets.com/reviews/10-brilliant-multi-level-navigation-menu-techniques.html
CSS guides
http://www.toxel.com/design/2009/01/11/top-50-best-css-articles-and-resources/
Open source apps for web-designers
http://sixrevisions.com/tools/30-useful-open-source-apps-for-web-designers