• Coalition for Vehicle Choice.
• Haynes has good repair manuals.
• CAAM is a portal for classic car fans.
• If you really get fed-up with traffic, you might be interested in Demolition Derby Tips (incl. car-prep and driving advice).

California-Specific

• E-ZPass Regional Consortium is a godsend for toll-booth-challenged drivers in NY/NJ/DE/MD/PA/MA.
• Smog Impact Fee Refund Center (California-specific).
• California PATH (Partners for Advanced Transit and Highways) tries to apply technology to moving traffic along.

Have the Need for Speed?

• National Motorists Association (NMA) lobbies against ridiculously-low speed limits and has ticket-fighting information.
• Speedtraps in the USA.
• Speed Trap Exchange.
• Valentine One is consistently rated the most-effective radar detector.

Car Buying

• Cars.com has tons of info (and for-sale ad search engine) on new and used cars. Includes the Car Talk [NPR] website.
• Price Auto Outlet sells off-lease automobiles at good prices.
• BestOffer.com has used car ads.

Pricing Services

• CPI has collectible vehicle plus motorcycle prices.
• Kelley Blue Book and Edmunds have used car trade-in values.
• Carprice.com has new and used car prices. Motorcycle prices, too.

Automobile as Advertising Vehicle

• BeetleBoards
• FreeCar.com
• NUR is one company that makes the huge printers used for this.
• If you want to design your own sticker, stickers4cars will make it for you.

Maps and Navigation

• Mapquest road atlas.
• Navigation Technologies makes the onboard map software used in many cars — and sells updates.
• ParkingPal was a nice idea that didn't make it past San Francisco.