Ancestry.com is making a big push for people to do this.
I have to laugh, though. If the government said, "We want to compile a DNA registry of as many Americans as we can, so we are opening up a voluntary program where you can submit your DNA..." Whoa.... !!!!!
You wouldn't be able to finish reading the announcement before the uproar about loss of privacy, about Big Brother, about government controlling our lives, etc., would hit the fan.
But now a private company is CHARGING people to register their DNA, and ::bingo!:: people are submitting their DNA in droves to find out if they are 1/248th Italian....
I will keep my DNA private, thank you. ;-)