You probably saw this link to U.S. Palm's new Defender body armor for civilians at Instapundit. It's an interesting concept.
I have a set of civilian body armor that I received as a gift in Iraq, though I didn't use it there -- the military had provided me with a set of Interceptor armor that was more practical for warfare. I've still got the other set, though it's packed away.
The probability of a home invasion in rural Georgia approaches zero, especially for those of us with dogs and rifles. Still, in an area without those advantages, I can see how keeping a set handy might be a sensible precaution. I would like to say, though, that if you already have a handgun and two hundred dollars to spend to improve your defensive capacity at home, the more sensible thing would be to use the money to buy a shotgun.