“Geometry and Billiards”, Serge Tabachnikov, ≈2005. ★ Department of Mathematics, Penn State University. A published book on the subject.
Source www.math.psu.edu

“Billiards in the Round”, Ivars Peterson, 1997-03-03. One HTML page.
Mathematical Association Of America's MathLand article. Discuss a billiard game played on a elliptical table, with illustrations. Source www.maa.org

Mathematician: John H. Conway. A newsgroup message on the etymology of parabola, hyperbola, and ellipse. (Local link. Copied with permission). conicsEtynomogy.txt.

Misc Links

“Occurrence Of The Conics” by By Jill Britton 2008-02. A page that give examples of conic sections in everyday life, with many illustrations. ★
Source britton.disted.camosun.bc.ca.

Hollister David. Images of moiré; patterns of circles and lines simulating conics. Including a nice small animation that simulate conics with changing eccentricity. The site includes some other very nice mathematical arts. Source clowder.net Hop David on Dandelin Spheres ★: Source clowder.net