Bloggers that operate WordPress.com blogs can now see who’s commenting the most on their blog and what posts they’re commenting on by looking at Site Stats. There’s a new comments panel that provides tabs for top commenters, most commented and a summary of comments.

Blogs with less than 1,000 comments will have stats that are based on all comments made since the beginning. Otherwise, you’ll see stats for the past three months.

“For example, a blog with 500 total comments will have the most commented post be the one that has had the most comments across the entire life of the blog,” explains Greg on the WordPress.com blog. “For this blog (with 87K comments) the most commented post is chosen from the posts that were posted in the past three months.”

“Jetpack users, please bear with us as we improve Jetpack to serve you the new comment stats in the future,” he says.

WordPress also announced a couple of new apps that can be integrated with WordPress.com blogs: Feedfabrik and Empire Avenue. The former converts the blog into a book format, and the latter is used for virtual currency.

“Feedfabrik makes it easy to convert your WordPress.com blog into a book format, and even allows you to customize the cover design and book contents,” explains WordPress’ Justin Shreve. “You can order a hard copy of your book, or a digital PDF edition.”

“Empire Avenue is a Social Stock Market, where your social networking activity and engagement earn you virtual currency and determine your virtual share price,” he says. “It also helps you discover new people and brands, and allows you to invest virtual currency in their profiles by buying shares on the Social Stock Market.”

More on these here.