Speaking to VGChartz, Valve's Doug Lombardi has said that Left 4 Dead pre-orders are trouncing those taken by The Orange Box.
"Pre-orders for Left 4 Dead are currently exceeding Orange Box pre-orders by well over 40 percent, this driven largely by the 10 percent off promotion being offered now for both versions," he said.
"And one could assume this trend over Orange will continue as the pre-launch demo hits and the largest consumer advertising campaign for any Valve game begins on buses, buildings, billboards, TV, magazines, and web sites in the next couple weeks."
More through there. The multiplay shooter's out for 360 and PC in November.