Thanks, MD11Fr8Dog!

fly2ski - Yes, the Roth 401k was introduced in 2006. Just like Roth IRAs, you put in after-tax dollars, let your investments grow for a few decades and then extract your money with no capital gains or other taxes. Pretty sweet deal for the younger crowd. The 401k limit is $16,500 this year, so if you and your spouse each have a Roth IRA ($5000 each) in addition to the Roth 401k, you could conceivably invest $26,500/year to then grow tax free for your retirement. Not too shabby! (Note: I cannot invest $26,500/year, hence the word "conceivably.")