All About Circuits - Capacitors
- An introduction to capacitors. Theory, pictures, links to other parts of a web-book of electrical theory.
- http://www.allaboutcircuits.com/vol_1/chpt_13/index.html

The Dark Horse in the Race to Power Hybrid Cars
- Are ultracapacitors the key to making hybrids king of the auto market? [Scientific American]
- http://sciam.com/article.cfm?articleId=AE786E24-E7F2-99DF-3546F86843FBD646&chanId=sa013&modsrc=most_popular

Ultracapacitors Challenge the Battery
- article written by chair of group devoted to promoting ultracapacitor technology includes web addresses of makers.
- http://www.worldandi.com/subscribers/feature_detail.asp?num=23938

Supercapacitor
- Wikipedia entry includes picture, history, applications, Ragone plot, diagram, links, and current state.
- http://en.wikipedia.org/wiki/Supercapacitor

UltraCapacitors and SuperCapacitors
- Information on how an ultracapacitor works, manufacturers, uses, and links to news.
- http://www.ultracapacitors.org/

Maxwell Licenses Ultracapacitor Technology To Shanghai Group
- to enhance reliability and efficiency of electric power infrastructure.
- http://www.greencarcongress.com/2006/04/maxwell_license.html

S&C to Develop Wind Farm Energy Storage.
- SuperCapacitors make an "Electronic Shock Absorber” (ESA).
- http://www.sandc.com/webzine/030705_1.asp

Green Car Congress: Holden (GM) and CSIRO Working on Next-Gen Supercaps
- Australian groups partnering on components for electric vehicles.
- http://www.greencarcongress.com/2004/11/holden_gm_and_c.html

Capacitors, Tutorial
- Includes history, types, color codes, illustrations, and formulae.
- http://www.uoguelph.ca/~antoon/gadgets/caps/caps.html

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.
- http://www.williamson-labs.com/480_rlc-c.htm

Los Alamos researchers charge ahead in ultracapacitors
- United States national laboratory press release announcing device capable of more charge-discharge cycles.
- http://www.lanl.gov/worldview/news/releases/archive/99-051.shtml

Okamura Laboratory - for ultracapacitor, supercapacitor
- Licenses developed ultracapacitor or supercapacitor systems for hybrid vehicles, solar, windmill, and power line backup.
- http://www.okamura-lab.com/

Maxwell Technologies - Ultracapacitor Overview
- PowerCache ultracapacitors claim up to 100 times the energy of conventional capacitors and ten times the power of ordinary batteries.
- http://www.maxwell.com/ultracapacitors/

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.
- http://www.tavrima.com/