Drivemocion's light-up Thanks

What It Is: Drivers no longer have to rely on a hand wave or a bumper sticker to send a message to fellow motorists.

Car-to-car messaging products range from cute light-up smiley faces to customizable electronic mini-billboards.

You also can have an actual conversation with another motorist on a shared, anonymous cellular service that mixes social networking and driving.

How to Get It: Au-My's Drivemocion flashes sad or smiley faces as well as text messages such as "Thanks," "Back off" and the more pointed "Idiot" to other drivers. Battery-powered Drivemocion sticks to the back window with a suction cup and is controlled by a wireless remote.

For those who want more of a say in messaging, they can set up personalized scrolling mini-billboards in a car window or on a license plate. Motion LED's mobile billboard also attaches to a window with a suction cup and is controlled via remote. The Mini version holds up to nine messages, while the Pro-series holds up to 24 notes.

Drivemocion's smiley faces

Roadmaster's digital license-plate frame scrolls messages in red letters in three different speeds. Drivers who sign up with Delta Meridian Inc.'s SameLane place stickers on their car and register their license plate and cellphone; when they come across each other, they call the service, which rings up the fellow SameLane member.

Full article continued at The Wall Street Journal: Reinventing the Wheel.