I used the same insulating foamboard as Sue Metz, except I used mine to create a custom sewing/quilting table. I wrote it up here: http://www.squidoo.com/sewingtable

I am very particular about having things at the right height and avoiding shoulder, arm and neck strain. My need to have a very large, flat surface for sewing and quilting led me to create this system and I absolutely love it. It's nothing more than a large piece of vinyl over layers of custom-cut foamboard but it beats every sewing table I've ever used.