More general links:
Descendants of Signers of the Declaration of Independence
http://www.dsdi1776.com/
membership page:
http://www.dsdi1776.com/Membership/membership1.htm
Steal this info directly for the Wiki:
Only 15 of the 56 signers have male descendants today.
These Signers have no descendants: William Whipple, John Hancock, Samuel Huntington, James Smith, James Wilson, Caesar Rodney, George Wythe, Francis Lightfoot Lee, Joseph Hewes, Thomas Lynch, Jr. Button Gwinnett, Lyman Hall, and George Walton.
These Signers have no same surname (male) descendants: Josiah Bartlett, Matthew Thornton, Samuel Adams, Elbridge Gerry, William Williams, William Floyd, Francis Lewis, Robert Morris, Benjamin Rush, Benjamin Franklin, George Clymer, George Taylor, George Ross, Thomas McKean, Samuel Chase, Thomas Stone, Thomas Jefferson, William Hooper and John Penn.
These Signers have very doubtful same surname (male) descendants: Stephen Hopkins, William Ellery, Oliver Wolcott, John Witherspoon, Abraham Clark, John Morton, Carter Braxton, Edward Rutledge.
The remainder of the Signers are known to have same surname (male) descendants.
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I have had wayyyyy too much fun playing at this site:
Interactive John Trumbull's “Declaration of Independence”.
On this page you will find an interactive version of John Trumbull's famous painting, "Declaration of Independence". John Trumbull's "Declaration of Independence" painting is one of the oldest and most prominent elements of Americana. It is exhibited in the Capitol Rotunda in Washington, DC. It is also depicted on the back of the $2 bill.
http://www.quiz-tree.com/Declaration-of-Independence-Trumbull.html