KPI's for blogs have not been defined yet (as far as I know). Here my approach to turn web analytics data in something useful:Top 10 KPI's for blog
1. Average visitors per blog post (new/returning...) 2. Average comments per post (per day/week/month) 3. Number of new commentators per day/week/month 4. Number of returning commentators day/week/month 5. Everything related with RSS (new subscribers...) 6. Single access pages (drop out rate / bounce rate...)
7. Number of searches per day/week/month 8. Number of trackbacks per day/week/month 9. Number of Akismet spam per day/week/month 10. Number of Incoming links :-) Feel free to add/comment!