There are many authors and writers that are favourites of mine. Here are a few:

History

Nora Chadwick - www.librarything.com/author/chadwicknora
Lucia Gahlin - here
Laurence Gardner - http://graal.co.uk/
Christopher Knight - www.knight-lomas.com/index2.html
Keith Laidler - here
Gwendolyn Leick - www.chelsea.arts.ac.uk/17228.htm
Robert Lomas - www.knight-lomas.com/index2.html
Lorna Oakes - www.librarything.com/author/oakeslorna
Lynn Picknett - www.picknettprince.com/
Clive Prince - www.picknettprince.com/
David Rohl - www.davidrohl.com/
Andrew Sinclair - http://www.andrewsinclairtemplar.com/

Mountaineering

Chris Bonington - www.bonington.com/welcome.htm
Bear Grylls - www.beargrylls.com/
Reinhold Messner - www.answers.com/topic/reinhold-messner
Martin Moran - www.moran-mountain.co.uk/

Travel

Michael Palin - www.palinstravels.co.uk/
Michael Wood - www.librarything.com/author/woodmichael

Creative Writing

Jennifer Bacia - www.jenniferbacia.com/
Michael Legat - www.bookends.clara.net/
Rhona Martin - www.librarything.com/author/martinrhona
John Paxton Sheriff - www.johnpaxtonsheriff.co.uk/index.php?p=1_4_Links