Another one that builds its own engine

Seems that Bethesda is not the only studio building its own toolset for games, Obsidian's next title: Dungeon Siege 3, is being built on top of their very own Onyx engine. The advantages? If something goes wrong, the guy who wrote the code is 10 feet away, says Rich Taylor, Fallout NV project leader. Although undeniable, the reason seems week weak considering that several large studios have been successfully using Unreal as the foundation for their games.
Anyway, osunds nice and Im pretty sure that Obsidian has enough change in the wallet to pay for its custom made engine. Now lets wait for Dugeon Siege 3 to see Onyx on the wild.

The engine behind Skyrim

The news about Emergent bankruptcy and the poor precedent of Fallout 3 (and New Vegas) graphics, raised a lot of questions about the future of Bethesda games. But GameInformer has an interesting and extensive article about the new technology at the heart of Elder's Scroll V: Skyrim.
Bethesda has developed its own compoenent and acquired or modified third party ones to build what they call Creation Engine, a really impressive framework. Check the articles for the details.