In the old classic Blogger, your Interests, Favorite Movies, Music and Books that you added to your profile was clickable. This means that other surfers/bloggers can use that to find blogs sharing the same interests. However, when Blogger Beta (now New Blogger) was introduced, these became unclickable words, thus useless.
Now according to Blogger Buzz Browse Profiles! Find new blogs to read!, as of 7 August 2007, these interests that you list in your profile are now active links, that means if you have put "blogging" as one of your interests, anyone viewing your profile can click on "blogging" and find other blogs whose interests are also blogging. This apply not only to your profile, but also other bloggers' profiles as well. This implies the more interests, favorite movies, music, books, that you add to your profile, the higher the chances that some other surfers/bloggers will find your blog. So put as many of them as you can into your profile. That is a very good way to try to bring more traffic to your blog.
If you do not know how to do that, sign into Blogger at blogger.com and you will end up in the Dashboard containing a list of blogs you have created. At the top right corner, click EDIT PROFILE and you will get the page where you can add all the interests, favorite movies, music and books you want.