I saw you delicioused some sites about white-boards. Most are really
expensive, but after quite a bit of research, my roommate and I went down to our local art store (Utrecht) and bought a 25 foot by 5 foot roll of acetate (the stuff overheads are made out of) for like $25. We cut off a big piece and pinned it to the wall with thumb tacks. It
works awesomely, and I would highly recommend it.