I would suggest you try with the remove duplicates sample, as described in BOL.
There is a dll in there, which you have to make part of your GAC (by running GACUtil), whereafter you can add it to your palette.
I went through the example, and after enduring some levels of frustration I got it to work, and I regularly use this component as part of my SSIS assembly these days.
It will also give you good practice on getting tabledifference installed in a similar way.
Good luck, and shout if you get stuck
~PD