Projective

Important Concepts from Projective Geometry
Webtext by Paul Beardsley.
http://www.dai.ed.ac.uk/CVonline/LOCAL_COPIES/BEARDSLEY/beardsley.html

An Introduction to Projective Geometry (for Computer Vision)
A monograph aiming to provide a readable introduction to the field of projective geometry and a handy reference for some of the more important equations. HTML, PS or PDF versions.
http://ai.stanford.edu/~birch/projective/

Lecture Notes on Projective Geometry
By Balázs Csikós. Budapest Semesters in Mathematics. In DVI format.
http://www.cs.elte.hu/geometry/csikos/proj/proj.html

MathWorld
Index to articles on Projective Geometry.
http://mathworld.wolfram.com/topics/ProjectiveGeometry.html

Projective Geometry
Rudolf Steiner's approach.
http://www.nct.anth.org.uk/

Projective Geometry for Multiple View Analysis
A new framework for studying the problems of camera calibration, motion determination, and 3D structure reconstruction in the most general case of totally uncalibrated views.
http://www.ai.sri.com/~luong/research/projective.html

Projective Geometry Resources
Part of the Math Forum.
http://mathforum.org/library/topics/projective_g/

Wilson Stothers' Cabri and Conics Pages
A site devoted to (mainly projective geometry) illustrated by Cabri II and CabriJava.
http://www.maths.gla.ac.uk/~wilson/cabripages/cabri0.html