Go out and buy a Shredder that is guaranteed NOT to jam in the first place.
I like my shredder from Fellowes. The thing is quiet, safe, and most importantly NEVER jams. I had a brand I had never heard of for my first shredder, thank goodness I didn't pay allot for it. For my money, Fellowes makes the best shredder around.
You can check their offering out at: http://www.fellowes.com/Fellowes/site/products/ProductsCategory.aspx?Name=SHREDDERS