I've been testing a number of different web statistics tools, and the current king of the mountain is statcounter.com. This is the first web stats product i've seen that presents a very clear interface, uses some AJAX, and comes from a SEO mentality, which I think is super important.
I was using nedstadt forever, but it seemed to be getting sluggish, and saw absolutley no innovation in the last two years, so I knew it was time to look elsewhere. The in-built typepad stats aren't that useful and I'm really looking for one place to track the stats for all my blogs.
I used MyBlogLog, which is getting some hype, for about 2 days, but tracking only outbound links I found pretty useless, so I got rid of it.
I like statcounter.com because after putting it on my blogs and waiting about an hour, I was able to get pretty much all the detail I was looking for about keywords, geography, number of hits, etc. And they say outbound links is coming soon for those who are wondering!
I also love the fact you can have multiple "projects" all in one place. This is something that was really lacking in netstadt. At any rate, this is the first stats product I've seen that I would consider upgrading to a "pro" level.
screenshots below (click to see larger view)