Title and description are very important to let people know what your blog is about. Blogger.com allows static title and description for your blog, no matter your post is different from the central theme of your blog.
But now there is a hack to play with these two things. You can provide separate title/description to your particular post or labels. i.e your main blog url, post and labels will be having different title/description.
Check it out at provide different title and description to posts and labels