"I have more lawyers than I have employees," said the entrepreneur, who asked to remain anonymous for fear he would be the target of even more lawsuits.

Young companies that are looking for venture capital are most likely to settle, so goes the conventional wisdom, because they have limited cash and worry that a lawsuit will scare off investors. It's cheap to bring a lawsuit, but expensive—$2.5 million on average—to defend against one. Not surprisingly, the majority of patent suits are settled out of court.

"The system is so stacked against me," said the e-commerce entrepreneur. "To prove I'm right, it will cost me more money than I have raised in my company's existence. If I win, I don't get the money back, and if I lose, I owe triple damages."

• An iPhone app called VizWiz helps blind users by letting them take a picture of something that is confusing -- and then crowdsourcing a helpful description to make things clear. This app uses Amazon's Mechanical Turk service to obtain helpful people, and the average turnaround time for a description is 27 seconds. [url]
• The Poet image description tool is open source software that helps to crowdsource image descriptions for digital books. This tool is aimed at textbook illustrations that aren't too helpful for people who can't see them. [url]
• The Tacit project is developing a hand-held sonar device with haptic feedback -- a technological take on the white cane. It's still just a prototype device, but so far, users seem to be able to use it fairly quickly without much training. [url]
• Haptic shoes could help people navigate by vibrating different parts of the shoe to tell the wearer if there are obstacles ahead. These shoes, like the Tacit project's handheld, are based on open Arduino hardware -- allowing other developers to contribute improvements and build upon existing tools. [url]