Try these:

A Short History of Geometry

Good overall view of the history of geometry throughout the world. Nice time line and short summaries of geometers' contributions, with most links leading to the web site below.

Biographies of Famous Geometers

from the University of Glasgow, Scotland

History of Mathematics Archive

from the University of St Andrews, Scotland

Women Mathematicians

Biographies from Agnes Scott College

Google Directory - Science > Math > Mathematicians

Biographies for about a dozen geometers, some short, some long

Books on reserve in our library

The World of Mathematics (4 vols.) by Newman

The Ages of Mathematics (3 vols.) Linn, ed.

The History of Mathematics, an Introduction by Burton

Mathematical People by Albers and Alexanderson

A Journey Through Genius by Dunham

The Continuum Dictionary of Women's Biography

International Dictionary of 20th Century Biography

A Concise History of Mathematics by Struik

Math for Smarty Pants by Burns

Shapes to Cut Out, Color and Make by Jenkins

Geometry and the Visual Arts by Pedoe