Valve: Left 4 Dead Half-price Sale Saw 3000% Increase, Beat Launch Numbers

Newell also mentioned that new Steam customers jumped 1600% over the same weekend, according to G4TV. Retail sales remained constant.

Sales of Team Fortress 2 went up 106% following a free update to the game. Retail wasn't left out in this case, with sales jumping 28%.

The massive Steam holiday sale was also a big win for Valve and its partners. The following holiday sales data was released, showing the sales breakdown organized by price reduction: