Results
Four cousins who trace to NH/1662, Samuel and John Whidden, have found they are positively related 99.99% but cannot determine at this time whether uncle/nephew or brothers as family lore states. Further testing needs to be done, especially with Whitten cousins in California and Washington state.
In 2009 two Whittens were tested and proven 99.99% postitive to a William and Edah Whitten in North Carolina. A third Whitten, who cannot trace any connection to NC is a match on y-DNA-12 so a -25 or -37 marker test may prove/disprove whether he is related as well.
Several Whitten/Whidden/Wittens have had mt-DNA tests done, including one Mega test and though two of them are haplogroup U5, none are close enough to be related, though that's normal for a family surname oriented project. Those with mt-DNA results need to also join the corresponding project for your haplogroup. Good luck in finding maternal cousins. Its been done and the more people that get tested the better the chances. If you can get cousins known to be related tested that is even better.