Force.com IDE Developer Guide

Get Started with the Force.com IDE
Develop with the Force.com IDE
Test Code with the Force.com IDE
Deploy Code with the Force.com IDE
Get Started with the Apex Debugger
Solutions to Common Force.com IDE Problems
Force.com IDE Release Notes
Useful References
PDF

Package Explorer

The Package Explorer provides a hierarchical tree view of the projects and files in your workspace, and works just like the standard Eclipse Project Explorer. The Force.com IDE provides additional menu options; for details, see Force.com Context (Right-Click) Menu.The Package Explorer tree view with the src/objects folder open and the Mileage custom object highlightedFor information on standard project folders and files, see Force.com Project Basics.