What have you found most interesting about the variable objects?

I have created a trivial 3 tier app where font end .aspx file creates an object from a middle tier class in a .vb file and that class creates an object in the data tier and the data tier creates data sets from sql.

Now I'm trying to get familiar with the form object.

Next I thought I would look at the print framework and see if it might do away with PDF files :)

I'm impressed with the beauty of the language, but it will be hard to leave Web Connect.

>>What objects in the CLR have people found most interesting to delve into besides the obviously valuable ADO objects?
>
>Variables.