Just a couple of years ago, the idea of a device projecting information driving directions onto a car's windshield seemed super futuristic. Now they're becoming a reality, with the European release of Pioneer's NavGate head-up display the latest. And believe it or not, this one's actually pretty affordable.
Here's a great idea for SCUBA divers: a mask with a tiny LCD panel that shows your depth, time you've been under the water and cylinder pressure. The transmitter gathers the data at the regulator and sends it to this mini display mounted right where you need it.