As we reported a few days ago, Steam has now added a number of library titles from publisher Bethesda Softworks to their line-up of downloadable PC games today.Elder Scrolls III: Morrowind and Elder Scrolls IV Oblivion, the two acclaimed open world fantasy RPG titles and the first person horror action-adventure game Call of Cthulhu: Dark Corners of the Earth are currently available for 20 percent off their usual Steam prices for one week.

Steam has also added four Strategy First games (Ankh 2 - Heart of Osiris, Ankh 3 - Battle of the Gods, BC Kings and Port Royale 2) with all four also available for 20 percent off their normal prices for a week. Two recent Atari games, The Chronicles of Riddick: Assault on Dark Athena and Ghostbusters, are also available via Steam today but no discounts for them.

Over at Stardock's Impulse site they have added three Ubisoft games (Assassin's Creed, Far Cry 2 and Heroes of Might & Magic V: Tribes of the East) to their library and are currently on sale for 10 percent off their normal price.