Ram:

I have given the assemblies to be referred in the article itself (see 3.Getting started)

AndreQ1:

You could combine the common (or default) settings into functions and can then be called appropriately.

For simple file transfers, DTS and SSIS may not differ much. When it comes to Transformations, SSIS provides many new features when compared to DTS. You can have a look at MSDN for the different Transformations supported in SSIS. Hope that helps.