As Paul noted, you descend from John Tower and Margaret Ibrook Tower.Charlemagne Tower, wrote a book in the late 1800's titled, "Tower Family Genealogy, The History of John Tower of Hingham, MA and his Descendants".It is available online at antiquarian bookstores, or you can occasionally find some copies on ebay.
The Tower Genealogical Society, all descendants of John Tower and/or his descendants' spouses, is very active.I am currently the Treasurer of the group.We maintain a website, www.towergenealogy.com, and are currently very actively planning a Tower family reunion in Hingham, MA in June 2009 to celebrate the 400th birthday of John Tower and the 100th anniversary of the incorporation of the Tower Genealogical Society.The TGS has also published two more family textbooks, Vol. II (difficult to obtain, as it is out of print) and Vol. III which is available through the society.
If you have any other questions, please email me at firstname.lastname@example.org, and I will try to help you, or at least refer you to the president of the society.