Have KISSmetrics installed on multiple domains? Want to see visits and conversion rate for each domain? Now you can this script fires an event whenever a user visits one of your domains. Will showup in KM as an event: Visited blog.yourdomain1.com Visited yourdomain2.com and so on…

// Segment Visitors by hostname
  jQuery(document).ready(function(){
    var refKm = document.referrer;
    var hostKm = document.location.hostname;
  
    // checks if visitor is from a different referrer
    if((hostKm.length > refKm.length && hostKm.indexOf(refKm) === -1) ||
      refKm.indexOf(hostKm) === -1)
      {
        _kmq.push(['record', 'Visited '+ hostKm]);
      }
  });

This comes in handy when you want to see stats for each domain separately or want to calculate conversion rate for visitors who have visited a particular site area. For example comonversion rate for people who visited blog.

Remember more granularity always comes in handy :).