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try this:

 void blabberingEavesdropper(nav_msgs::Odometry& msg)
    { 
          ROS_INFO("%f",msg.pose.position.x);
    }

try this:

 void blabberingEavesdropper(nav_msgs::Odometry& msg)
    { 
          ROS_INFO("%f",msg.pose.position.x);
    }

for subscribe the laser scanner data:

void laser(const sensor_msgs::LaserScan& msg)
{
    for(int i=0;i<msg.ranges.size();i++)
        ROS_INFO("RANGES[%d]=%f",i,msg.range[i]);
}