Bookmark This Searchable PHP Cross Reference of WordPress Source
This handy PHP Cross Reference of WordPress Source from Yoast is one of my favorite bookmarkable finds this week. It helps you to quickly find definitions of functions and variables within the WordPress source. You can search the current Trunk or any of the previous versions of WordPress. It allows you to search function, class, variable, or constant. While learning about how WordPress works, you could easily save hours by using this quick search tool.