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A start-up called Always Innovating will reveal the Touch Book, a portable device that works both as a netbook with a small keyboard and a touch-screen tablet. About the size of an 8.5-by-11-inch sheet of paper folded in half, the Touch Book is for those times when the iPhone isn't quite enough but a notebook computer is too big, says DEMO Executive Producer Chris Shipley.

Based on open source hardware designs, the Touch Book weights two pounds, offers "never-before-seen battery life," and is ideal for typing e-mail, opening an Office document, or playing games and watching videos, according to DEMO's company guide.

"This device will find a ready market among people who want a more capable read/write device with which to navigate cloud computing," DEMO says. "And with its ARM processor, Linux and commodity components, we won't be surprised to see an ecosystem of applications grow up around this product."

Always Innovating will be one of about 40 companies demonstrating new products and services on Monday and Tuesday at DEMO, a launch pad for emerging technology.