Recently I've been experimenting with some of the reports in the 2012 version of Family Tree Maker software. Something that I really like is how it synchronizes with my family tree database on Ancestry.com. I had never compiled a listing of my direct line ancestors and found this quite easy to do. From the research that I've done or gleaned from published family histories, my longest line goes back 15 generations.
Beginning with my grandparents and generation 3 (myself being generation 1), here's where I come from:
Otto William Petersen and Ruby Luella Pecht
William Leroy Kelly and Sina Harriet Bellinger
Jens Christian Petersen and Karoline Kristine Hansen
Leroy Pearl Pecht and Clara Rosella Laymon
Daniel Kelly and Mary Janice Welch
John William Bellinger and Harriet Emma Landon
Peder Jeremiasen and Elsia Katrine Laursen
Soren Hansen and Kristine Veddum Nelson
John Crispin Pecht and Amanda Melvina Stover
John J Laymon and Eliza Ann Olmstead
William D Kelly and Mary Casey
Mark Welch and Sarah Conneally
John William Bellinger and Sarah Roughe
Daniel C Landon and Anne Jane McVoy
Jeremias Poulsen and Mette Christendatter
Laust Laursen and Karen Poulsen
Nels Veddum and Marin Katrina ?
George Pecht/Peight and Rachel Hartsough
Samuel Stover and Elizabeth "Betsy" Kepler
James Laymon and Maria Sloan
Eben Andrews Olmstead and Anne Archibald
Kieran Kelly and ?
Welch and ?
John Conneally and ?
John William Bellinger and Anna Eva Clapsaddle
Samuel Landon and Margaret Schultz/Scholtz
James McVoy and Sarah Larvin
Povel Madson and ?
John Hartsock and ?
Emanuel Stover and Susanna Price
Andrew Kepler and Anna Maria Kramer
Abraham Laymon and Elizabeth Goodpaster
George Sloan and Mary Storey
David Olmstead and ?
Johannes/John F Bellinger and Ernestina Harter
Andrew Clapsaddle and Maria Dygert
William Landon and Experience Cooke
Jacob Schultz/Scholtz and ?
Andreas Bernhardt Kepler and Maria Elizabetha Lindamood
Daniel Kramer and Ann Maria Geise
David Olmstead and Rebecca Jackson
Frederick Peter Bellinger and Catherine Webber
Henry Harter and Catherine Piper
William Landon and Mercy Orange
Elisha Cooke and Rebecca Edgerton
Silas Olmstead and Lydia Sloan
Daniel Jackson and ?
Philip Bellinger and ?
Nicholas Weber and Barbara ?
Daniel Landon and Dorothy Holdredge
William Cooke and Tabitha Hall
James Olmstead and Hannah ?
Johannes Bellinger and Anna Maria Margaretha Kuhn
William Holdredge and Deborah Elliott
Jacob Cooke and Lydia Miller
Elisha Hall and Lydia ?
Nathan Olmstead and Mercy ?
Deiterich Bellinger and Barbara Gessen
Hans Kuhn and Catharina ?
Jacob Cooke and Damaris Hopkins
John Hall and ?
Hans Bellinger and Anna ?
Michael Gessen and ?
Francis Cooke (Mayflower) and Hester Mahieu
Stephen Hopkins (Mayflower) and Elizabeth Fisher
Richard Olmsted and ?
John Hopkins and Elizabeth Williams
Richard Olmsted and ?
James Olmsted and Jane Bristow
James Olmsted and Alice Hawykins (or Sorrell)