Links:
Links to some popular component manufacturers and distributers.

Featrued Link:
http://truckatronics.i8.com/ - Helpful site that features information on car audio systems.

Semiconductor Manufacturers:
www.national.com - National Semiconductor, source of semiconductors and datasheers. Also offers free samples of most of their products.
www.fairchildsemi.com - Fairchild Semiconductor, datacheets, free samples button, but they never ship
www.maxim-ic.com - Dallas Semiconductor Maxim products. Offers free samples of all of their products.

Distuibutors:
www.digikey.com - Electronic parts supplier, many products. Catalog avaliable through website or by calling 1-800-DIGI-KEY.
www.jameco.com - Jameco Electronics. Offers the best prices on a wide range of semiconductors. Catalog Avaliable through website or by calling 1-800-831-4242.
www.cs-sales.com - C&S Sales, less of a part supply company, and more of testing equipment, electronics kits, and repair tools. Catalog avaliable through website or by calling 1-800-292-7711.
www.newark.com - Newark electronics. Huge selection at decent pricing. Catalog avaliable through website or by calling 1-800-4-NEWARK
www.future-active.com - Yet another electronic part supplier, tool and measuring devices.

Circuits:
www.discovercircuits.com - Discover Circuits, links to over 1000 circuits, and tips for electronics
http://www.firebottle.com/ampage/schems/ - The AMPAGE. Links to many audio amplifier circuits.