• Black Hole Images at "Astronomy Picture of the Day" (APOD) - From NASA's "Astronomy Picture of the Day" archive, the three most educational images (editor's choice) related to black holes.
• Black Holes - Pages by the relativity group at Cambridge University, aimed at a general audience. They include a brief introduction to black holes, information about observational evidence, and a section on black holes and critical phenomena.
• Black Holes & Co. - Collection of articles about various aspects of black hole physics, from astronomical observations to the question of why black holes have no hair. Part of the "Spotlights on Relativity" series on Einstein Online; written for a general audience.
• Black Holes and Beyond - Part of the "Spacetime Wrinkles" exhibit published by the National Center for Supercomputing Applications: descriptions of what black holes are, how they might be detected, and what kinds of gravitational waves they should produce. Aimed at a general audience.
• Do Black Holes Exist in Our Universe? - Presentation about stellar black holes, suitable for undergraduate students. Created by Eduard Westra for a second-year astronomy course he was taking at the Australian National University.
• Frequently Asked Questions about Black Holes - FAQ for the usenet newsgroup sci.physics; compiled by Matt McIrvin; last change 1995. Suitable for a general audience; addresses a number of fundamental questions such as "How does gravity get out of a black hole" or "What happens if you fall in".
• Gravity's Relentless Pull - Information about black holes for a general audience, including virtual journeys and simulations, from the Space Telescope Science Institute (the people in charge of the Hubble Space Telescope).
• Imagine the Universe: Black Holes - Information about the astrophysics of black holes on the website of NASA's High-Energy Astrophysics Learning Center. Suitable for ages 14 and up.
• Jillian's Guide to Black Holes - An informal introduction to the different types of black holes, to what happens outside and inside such objects, and to how they can be detected; suitable for a general audience. Created by Jillian Bornak as the final project for a beginners' course on general relativity at Syracuse University in 2003.
• Resources Dealing with Black Holes, Singularities, and Event Horizons - List of articles, websites, and images on About.com, compiled by Nick Greene.
• Schwarzschild's Spacetime - Part of Rob Salgado's website "The light cone - an illuminating introduction to relativity" at Syracuse University, which explores relativity using simple spacetime diagrams. These particular pages explore the simplest black hole solution.
• ScienceDaily: Black Hole News - List of news articles and press releases related to all aspects of black hole physics, from theory to astronomical observations; updated frequently.
• Spacetime Geometry inside a Black Hole - Text by Jim Haldenwang describing the foundations of general relativity and some basic properties of black holes. Presupposes knowledge of calculus and basic concepts of special relativity.
• The Net Advance of Physics: Black Holes - A set of links to numerous black holes resources on the Web, this site is a useful starting point for finding technical articles on the topic.