The first Amendment right of free speech and the Fifth Amendment right to avoid self-incrimination are well known, but the Ninth Amendment is ignored. Pity, because it bears directly on abortion, the right to die, and gay rights.
The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people. --The Ninth Amendment
A little arcane, but something I've never thought about but should have and will now. Go read.