Patterns and Practices book: Upgrading Visual Basic 6.0 Applications to Visual Basic .NET and Visual Basic 2005
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnpag2/html/VB6ToVBNetUpgrade.asp

Visual Basic 6.0 to Visual Basic .NET Upgrade Assessment Tool
http://www.microsoft.com/downloads/details.aspx?FamilyId=10C491A2-FC67-4509-BC10-60C5C039A272&displaylang=en

Designing an Application Migration Strategy for Visual Basic 6.0 to Visual Basic .NET
http://msdn.microsoft.com/vbasic/reference/Migration/default.aspx?pull=/library/en-us/dv_vstechart/html/appmigrationstrat.asp

Free Book - Upgrading Microsoft Visual Basic 6.0 to Microsoft Visual Basic .NET:
http://msdn.microsoft.com/vbrun/staythepath/additionalresources/upgradingvb6/default.aspx

Upgrading Applications in Visual Basic:
http://msdn2.microsoft.com/en-us/library/dy163kx7(en-US,VS.80).aspx

Upgrading Applications Created in Previous Versions of Visual Basic:
http://msdn2.microsoft.com/en-us/library/47s4twtx

VB6 Code Advisor: suggest changes and best practices to ease your migration from Visual Basic 6.0 to Visual Basic .NET
http://www.microsoft.com/downloads/details.aspx?FamilyID=a656371a-b5c0-4d40-b015-0caa02634fae&DisplayLang=de

Schöne Grüße

Daniel