Here's one, only show the home when the owner is home.

I disagree with nutty, after all of the media attention given to this crime there may be a chance for copy cats. Agents protect yourselves however needed/possible.

To nutty, my mother is a real estate agent; I'd be more than happy if she had a buddy system available to her. I've worried about her more than once showing properties to people at all times of the day and night. Tell me, if it was your mother that was killed would you still think everyone was over-reacting?

As a realtor myself I don't think he is over reacting at all! I'm sure the "buddy" agents applies mostly to agents who are meeting customers for the 1st time. The local office I work with has had a long standing rule that when ever it is needed/wanted by an agent there is always someone available to go along on a showing when meeting someone for the first time expecially when it is a vacant &/or remote property. Us real estate agents are the only proffesion that I can think of that is available 7 days a week, all day and into the late evenings that meet total strangers at homes all the time. Whats more anyone who has sold a house before knows that agents prefer the owner to not be home for showings, making most all showings at a location where there is no one around to help you if there should be a problem.
As for this case yes it is rare and lets all hope that it stays that way. In the mean time having a buddy system, meeting prospective buyers at the office and letting others in your office know your schedule and where you will be not only will give everyone the "warm and fuzzy" feeling, but also keep something like this from happening again.

Nutty, I've gotta say that is pretty inappropriate considering the circumstances.