Just wanted to say I'm basically finally converted to wordpress at http://www.ensight.org. I'm not sure what the most traffic'd blogs for WP are, but I can't be far off with 100K monthly visitors.
Really enjoying WordPress so far. Being able to modify it, and dynamic pages (no rebuilds) were huge pluses in moving from MT. I really enjoy MT and will likely be hacking together some of the things I enjoyed about it... But yeah, definitely a great piece of software, and thanks to the community to all the help they gave me during installation :)