We will be moving to VS.NET 2008/C# 3.0/.net 3.5/SQL2005/SQL2008 with in the ML v7.1 release, ML/DNN v7.1 release, and IS SP4 release.
For now, use VS.NET 2005. SQL 2000/2005 is also fine now. Beginning in ML v7.1, SQL 2005 will be required at a min
Summary:
ML v7.0.x.x: VS.NET 2005, C# 2.0, .net 2.0/3.0, SQL 2000/2005
ML/DNN v7.0.x.x: : VS.NET 2005, C# 2.0, .net 2.0/3.0, SQL 2000/2005
IS SP3: : VS.NET 2005, C# 2.0, .net 2.0/3.0, SQL 2000/2005
ML v7.1.x.x: VS.NET 2008, C# 3.0, .net 3.5, SQL 2005/2008
ML/DNN v7.1.x.x: VS.NET 2008, C# 3.0, .net 3.5, SQL 2005/2008
IS SP4: VS.NET 2008, C# 3.0, .net 3.5, SQL 2005/2008
Versions (with source) will still be available in VB.NET also of course.
More migration information & platform planning information to be posted here in the next few weeks.
PS. Don't ask us for release ETA's just yet This is just for your longer term planning/client advice purposes.