The Microsoft Certified Professional Developer: Web Developer (MCPD: Web Developer) certification demonstrates that you have the comprehensive skills that are required to build interactive, data-driven Web applications that use ASP.NET 2.0 for both intranet and Internet uses.

MCPD: Web Developer candidates must first complete the requirements for the MCTS: .NET Framework 2.0 Web Applications credential (two exams). After earning this certification, candidates may earn their MCPD: Web Developer by passing one additional required exam.

If you are a Microsoft Certified Application Developer (MCAD), you can upgrade to the MCPD: Web Developer certification by taking one upgrade exam. You do not need to obtain the MCTS prerequisite credential if you take the upgrade exam.

For more information:
http://www.microsoft.com/learning/mcp/mcpd/webdev/

CORE EXAMS
(70-528) .NET 2.0 Web-based Application Development ^vs 
(70-536) .NET 2.0 Application Development ^vs 
(70-547) Designing and Developing Web Applications ^vs 
(70-551) Upgrade MCAD to MCPD Web