I recommended proximity a couple of pages back, because of finding it's link on another website (
www.short-media.com/forums then look for the "short-media pub"). I went on a real jag playing that game. My best is 974 or thereabouts- I can't remember exactly. My highest one-turn score is 58. That felt good.
My #1 strategy is to use the 1's, 2's and 3's to block in my higher tiles so that the opponent can't turn them...