There are a number of blog tools that can be fun to play with. They either make blogging easier or they provide some amusement when you visit blogs.
Putting your email on your blog or profile allows readers to contact you. It makes you more approachable but also attracts spambots and spam is not fun. Pingoat has some cool anti-spam generators to protect your email thus allowing you to concentrate on the fun aspects of blogging.
Here is a screenshot:
Sometimes you may want to learn more about a blog. Technorati Blog Info is a browser toolbar button you can click on to find information about many of the blogs you visit.
Have you ever wondered how popular your blog is? Social Meter scans the major social websites to analyze a webpage's "social popularity". It is a fun way to get find out what is being said about your blog.
The final item I want to present shows how much your blog is "worth" based on the number of links it has. Hmmm, looks like BBD has to grow a little before I can retire.