The Complete Series:

Day 1: Installation
Day 2: The Admin Panel
Day 3: Creating a Theme from Scratch
Day 4: The WordPress Loop
Day 5: The Sidebar
Day 6: Single Pages
Day 7: Widgetize!
Day 8: Comments
Day 9: Tweaking the Comments
Day 10: Your First Plugin
Day 11: The PSD
Day 12: Slicing
Day 13: Theme Coding
Day 14: Home Page
Day 15: The Slider
Day 16: Custom Fields
Day 17: Slider
Day 18: Creating an AJAX Contact Form

Web: http://blog.themeforest.net/category/wordpress/