Science Fiction
Uplift War by David Brin
http://en.wikipedia.org/wiki/Uplift_Universe
Vorkosigan Saga by Bujold
http://en.wikipedia.org/wiki/Vorkosigan_Saga
The Alliance-Union universe by C. J. Cherryh
http://en.wikipedia.org/wiki/Alliance-Union_universe
Childe Cycle by Gordon R. Dickson
http://en.wikipedia.org/wiki/Dorsai
Fantasy
Vlad Taltos novels by Steven Brust
http://en.wikipedia.org/wiki/Vlad_Taltos
The True Game series by Sheri S Tepper
http://en.wikipedia.org/wiki/The_True_Game
Books of the Swords by Fred Saberhagen
http://en.wikipedia.org/wiki/Book_of_swords
Just off the top of my head mind you...