With Christmas only five days away, Steam has finally launched its 2010 holiday sale, discounting over a thousand games. The event will run through January 2 and each day will bring a new batch of sales. Today's featured titles include Battlefield: Bad Company 2 ($6.79), Prince of Persia (all titles 75% off), Super Meat Boy ($3.75), F.E.A.R. bundle ($9.99), and more.

Alongside the daily deals, Steam has cut prices on many publisher catalogs, not to mention the various greatly discounted bundles. For example, the 2K Mega Pack ($79.99) offers over three dozen games and expansions including BioShock 2, Mafia II, and Borderlands. Similar bundles are available for THQ, Bethesda, Square Enix / Eidos, Epic Games, Valve and many others.

If you happen to need a last minute gift for the casual gamer in your family, it's worth mentioning that more than 150 indie titles are also on sale in various $5 packs. As a reminder, today marks the conclusion of Steam's 'Treasure Hunt', so be sure to complete your objectives and log on before the end of the day for a chance to win 100 games of your choosing.