BubbleBum is a portable, inflatable booster seat for kids. It weighs less than a pound and deflates in minutes. Three can fit across the backseat of a car. Easily set up for carpooling. Designed for ages 4 to 11, between 40 and 100 pounds. $39.99 at target.com and babiesrus.com.
The Owie Pillow is designed to fit safely between the lower lateral seat belt and a pregnant mom's abdomen, alleviating pressure from the seat belt and reducing pain and discomfort. $34.99 at owiepillow.com,
The StrapCaddy attaches to the seat belt's shoulder harness so mom or dad can pop in an iPhone 4/4S and make and receive calls. Fits iPhone only (won't hold phone with attached battery boost). $19.99 at amazon.com.