We also used Adcenter Analytics and were happy with the product but now switched to Google Analytics. 2 things I suggested for using Google Analytics: 1. setup goals according to your business model. for example, if your blog require registration add Google Analytics code to the the thank you page of the registration form and you could track your goals. 2. Filter out your entrances. If you don't have that many visitors your (or other people who are working on the blog) own traffic can give you a wrong picture of your traffic. You can do so by going to Analytics Setting --> Filters --> Enter your IP address.
I'm glad that a Microsoft employee can recognize opponents good product.
BTW: This is a good point to filter out our IP. Cos i really don't have the real statistics if half of the numbers are my visits.
I also used Adcenter Analytics and were happy with the product but now switched to Google Analytics.