Links

Internet Raytracing Competition - Great place to look at what people are up to and what's being done. Several folks post their Povray source code.
IRTC Stats Page - JC has compiled all the IRTC statistics and made them available in a web-accessable form.
POV-Ray Wiki - The unofficial POV-Ray wiki

Transparency Example Page - This site is most interesting for their stain glass window example.
Isosurface Tutorial - This is just a great isosurface review. Mike Williams out did himself rendering just about everything possible. This is definately a must read if you're dabbling in isosurfaces.
Realistic Water With POV-Ray - Another good tutorial that delves into rendering water with Povray.
Pov-Ray Radiosity Test/Tutorial - Indoor Daylight Simulation - This is a great example on how to use radiosity to light a room
About While-Loops with POV-Ray - A tutorial on using while loops to do Povray macro's. Interesting stuff on generating mobius strips, swirls, and shells.

Huge Examples Library - This web page's author has managed to put together an impressive collection of example images and provides the .pov source to regenerate them yourself.
Landscape Of The Week - Christoph Hormann (who did the Realistic Water tutorial below), has been running a Landscape Of The Week project. Interesting stuff.
No Lights - Tim Nikias' website. He's got several good commentaries on how his images were created - must reading for the Povray fan.
Oyonale 3D Image gallery - 3D Renderings by Gilles Tran
The Persistence Of Ignorance - Jaime Vives Piqueres's Povray website

Mayang's Free Textures - Another great texture library with a more liberal licensing terms. Use 'em all you want, just don't sell them or redistribute large batches.
Paul Bourke's Texture Library - This is a great resource for finding textures for scenes.
The POVRay Objects Collection - A collection of mostly CSG objects. Lots of variety, though several are for Povray 3.1 and may require porting to 3.5.