I went to Home Depot, and bought some solid white tile board sometimes called Melamine tile wall panel (that material that is like a dry erase whiteboard). I got them to cut it into about thirty (1ft by 1ft) squares. (Cost about 10-15 dollars) I brought them to school and gave each student a whiteboard square and a dry erase marker. And instead of having them work problems on their paper, they wrote on the whiteboards. I really had no idea how much they loved it. the kids were asking if they could work problems on the whiteboard almost every day. Watch out though, 30 dry erase markers in one room will get you light headed unless you open a window.

http://www.nhk.or.jp/school/english/programs/school_02.html

http://www.pantagraph.com/articles/2007/04/04/wtf/doc4613b058c9ea0696310308.txt

http://www.cilc.org/collaboration_all.aspx