The following are some different resources to either convert your Visual Studio 2002/2003 projects to Visual Studio 2005 or just target the 1.1 framework in Visual Studio 2005.

 

Step-By-Step Guide to Converting Web Projects from Visual Studio .NET 2002/2003 to Visual Studio 2005

 

Jomo Fisher on MSBuild

Robert McLaws MSBuild Compatibility Toolkit 1.0

Nagaraju Palla's Building binaries targeting .NET 1.1 and .NET 1.0 in TeamBuild