Continuing education
WordPress changes fast, and to become a true student, one must continually learn and evolve their understanding of what WordPress is and can ultimately be. Luckily, there are plenty of resources online to help keep you up-to-date on the latest and greatest in the WP Universe.
WordPress Plugin Directory (http://wordpress.org/extend/plugins) is the official directory of Free WordPress plugins.
Smashing Magazine (http://smashingmagazine.com) is an online magazine focused on design and web development. Smashing also often commissions designers and developers to create free WordPress themes and plugins.
Nettuts+ (http://net.tutsplus.com), like Smashing, offers tons of great articles covering WordPress, plugins, and web development in general.
WPPlugins.com (http://wpplugins.com) is, according to their slogan, the WordPress App Store. They sell premium WordPress plugins that are not available in the free directory.
Delicious (http://delicious.com/popular/wordpress) is...