You have probably already noticed that when you search Google for something and your blog is present in the search results the Title of the result will be of the form: Blog Title + Post Title. This type of a title is not very attractive to the searchers, and your posts at some degree compete each other. Here is a hack that will change the title to the following more attractive format: Post Title + Blog Title. This trick will help you to optimize the blog title for Search Engines and is expected to drive more visitors to your blog.
Note that it will take some time for the new title format to appear in the search results (actually, following the next re-indexation of your blog by the crawling spider).
Please visit developer Website and follow the recommended way of code modification: http://www.bloggerplugins.org/2007/09/optimise-blog-title-for-search-engine.html