I took my second Microsoft Certification exam this afternoon ... and passed !
Phew ... it was tough - I thought I might have revised the wrong book at one point because it didn't seem familiar at all but I managed to 'scrape through' somehow (and got a much higher score than I expected)
So, I now have both:
070-315 Developing and Implementing Web Applications with Microsoft Visual C#? .NET and Microsoft Visual Studio .NET
070-320 Developing XML Web Services and Server Components with Microsoft Visual C# and the Microsoft .NET Framework
My next one (next week!) is:
070-229 Designing and Implementing Databases with Microsoft SQL Server? 2000 Enterprise Edition
When I get that I will be promoted from an MCP (Microsoft Certified Professional) to an MCAD (Microsoft Certified Application Developer). The plan then is to do another two exams to become an MCSD (Microsoft Certified Solution Developer).