Opting Out of Open Directory Listings for Webmasters
So what we did was introduce a new option at the page level - a robots meta tag – that tells the MSN search bot not to use the DMOZ site snippet. This is something that only can be done at Web page level, by a webmaster, and is not done as part of the robot.txt file.
So in your Web page you’d put
<META NAME="ROBOTS" CONTENT="NOODP">
<META NAME="msnbot" CONTENT="NOODP">