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There's two common mistakes however the people commit when creating from the title tag. The first one is to use a single title or usually the blog name for all the pages throughout the site. These must be avoided for the title from a page should match the content inside it.

Suppose you're using the title Sumair Doe’s  Blog on all the pages. Even if you've an post talking about “The New PlayStation 3″ the title tag for this post will be Sumair Doe’s Blog or which isn't very effective (because there's no match on the keywords). A much better title would be The New PlayStation 3  that's just equal to the post name rather than the blog name.

       The 2nd mistake that people commit are to include also a lot of keywords with the title tag hoping that search engines will take all of them into the consideration. Have you ever seen an title like these: “Tech Blog - where you find resources for blogs or websites or technology or internet and applications or software or hardware and pretty much everything else!”

This should as well comprise avoided because search engines put an value on title keywords depending on the total number from keywords. The result are that the higher the number from keywords you've with the title the smaller the value that will be attributed to each one from them.

A good title tag therefore should comprise short (no longer than 4 or 5 keywords) and pertinent to the content inside the page.

 Update: You could find the actual code I use with the article "How to Optimize Title Tag for WordPress".