Phy.org - Science: Technology: Energy: Storage: Capacitors

All About Circuits - Capacitors - An introduction to capacitors. Theory, pictures, links to other parts of a web-book of electrical theory.
Capacitors: What Good Are They? - Short description of a fundamental capacitor, and units used to measure capacitance. Illustrations of capacitors in electronic circuits, with animation.
Los Alamos researchers charge ahead in ultracapacitors - United States national laboratory press release announcing device capable of more charge-discharge cycles.
Maxwell Technologies - Ultracapacitor Overview - PowerCache ultracapacitors claim up to 100 times the energy of conventional capacitors and ten times the power of ordinary batteries.
Supercapacitor - Wikipedia entry includes picture, history, applications, Ragone plot, diagram, links, and current state.
Tavrima Canada Ltd. - Largest and most powerful supercapacitors. New energy storage technology suited for uses needing repeated bursts of power for fractions of a second to several minutes.
UltraCapacitors and SuperCapacitors - Information on how an ultracapacitor works, manufacturers, uses, and links to news.
Ultracapacitors Challenge the Battery - article written by chair of group devoted to promoting ultracapacitor technology includes web addresses of makers.

Media publications

Float like a battery, sting like a capacitor - Story about 1800-μF, 50V supercapacitor made to fit in a 2325 (button) cell holder includes contact info and pdf version. (Published 2004-04-15 00:00:00)
Green Car Congress: Holden (GM) and CSIRO Working on Next-Gen Supercaps - Australian groups partnering on components for electric vehicles. (Published 2004-11-19 00:00:00)
Maxwell Licenses Ultracapacitor Technology To Shanghai Group - to enhance reliability and efficiency of electric power infrastructure. (Published 2006-04-20 00:00:00)
The Charge of the Ultra - Capacitors - Nanotechnology takes energy storage beyond batteries [IEEE Spectrum] (Published 2007-11-15 00:00:00)
The Dark Horse in the Race to Power Hybrid Cars - Are ultracapacitors the key to making hybrids king of the auto market? [Scientific American] (Published 2007-08-28 00:00:00)