By default, most Blogger blogs have their blog title inside the title tag, because all the default templates have this code on their template:
However, if you are talking about a specific subject in your blog, it is better that the title of your post be included in the title tag, so that search engine can easily see your blog post and give your blog a better ranking on their results page. In order to do this, modify the above title tag as follows: (Simply copy and paste it on your Blogger template replacing the title tag above)
<title><$BlogTitle$><MainPage><Blogger> | <$BlogItemTitle$></Blogger></MainPage><ItemPage><Blogger> | <$BlogItemTitle$></Blogger></ItemPage></title>
With the code above, your title tag will contain the title of your blog plus the title of your blog posts seperated by the pipe sign (|) on the main page. Just limit your blog post to 2 or 3 on the main page, otherwise, you will have a very long title tag which search engines might ignore. Same thing will happen on the permalink pages, with the blog title and post title on the title tag. Just navigate this blog to see the results of that code if you don't get what I mean. =)
That's all folks! Happy weekend!
UPDATE: For Blogger Beta, refer to this Widget-Based XML post.
Technorati Tags: title tag, blog optimization, search engine optimization, blogtimize, blogtimization