Blog Title + Post Title
Such titles really doesn't attract much traffic to your blog. But it is the default setting in our blog template code. Now we will tweak the HTML code of our blog template to optimize the post title for search engines in a more attractive format
Post Title + Blog Title
This tweak will take a while for the Formatted titles to appear in search results(will appear when it is reindexed) but I am sure that it will increase the traffic to your blog.
Check out my post "Editing the HTML code of a Blogger Beta Template" to know how to edit the html code of the blogger template.
Search for the code <title><data:blog.pageTitle/></title> and replace the code with the following code
<b:if cond='data:blog.pageType == "index"'>
<title><data:blog.pageName/> ~ <data:blog.title/></title>
So use the tweak for more traffic.