T-shirts that flash your latest Facebook status, beds that help you track the quality of your sleep: Welcome to the so-called 'Internet of things.'

The industry of Web-connected devices, or what some analysts call the 'machine-to-machine' market, is expected to vault in size in the coming years: CapGemini estimates that the world M2M market will be worth 27.4 billion (US$35 billion) by 2013. Not surprisingly, a growing number of entrepreneurs have rushed to cash in on the business