• EU RoHS Directive(PDF)
• China RoHS(in Chinese)
• Final China RoHS(PDF)
• AeA China RoHS Overview
• China RoHS Article 3.1 Explanation(PDF)

• ATSDR - ToxFAQs™: Lead
• Public Health Statement for Lead
• Properties of Lead-Free Solders
• Solder Systems in Phase Diagrams and Computational Thermodynamics
• CDC’s Childhood Lead Poisoning Prevention Program
• Government Electronics and Information Technology Assoc.
• U.S. Dept. of Labor OSHA Safety and Health Topics: Lead
• JEDEC
• NIST - Materials for Microelectronics: Solder and Solderability Measurements for Microelectronics
• IPC Compliance Web Site
• IPC 1066(PDF)
• Effect of Cooling Rate on the Microstructure and Mechanical Behavior of Sn-3.5Ag Solder(PDF)
• Pb-Free Manufacturing Requirements for High-Complexity, Thermally Challenging Electronic Assemblies (PDF)
• Lead Free Soldering Home Page
• Book Review: "Lead-Free Electronics" (Chip Scale Review)
• RoHS discussion on Wikipedia
  

Commercial:

• RoHS Compliant Solutions & Lead-Free (Pb-Free) Devices from Texas Instruments
• Farnell RoHS and WEEE Directives Information pages
• Design Chain Associates
• China RoHS is Thornier Than EU RoHS: Here's What to Expect (AMR Research membership required)
• SN100C vs. SAC 305 wave soldering (discussion thread)