Our 3 are all getting DS's. They can only play with it as much as you allow! I bought ours DS's as we do a lot of long distance car travel in the year (at least 3 x 28hr return trips). Also DD1 is at dancing 6 hours a week, and the other 2 have to wait with me so I figure they deserve a bit of entertainment.
Otherwise a lot of books and clothes really. I got a lot of stocking stuffers from the Australian Geographic shop this year, awesome stuff.