To Roth or not to Roth, that is the question. Starting in 2008, like many other employers, my employer also started offering a Roth 401k option in our 401(k) plan.
This question of whether one is better off with contributing to the Traditional 401k or contributing to the Roth 401k has been the subject of a lot of debate. Although there is no one-size-fits-all answer, I think for most people the majority, if not 100%, of the contribution should go to a Traditional 401(k).