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4.Dont use so much widgets in your blog. Because use of huge widgets cause of taking long time to loading website.
5.On the both sidebar of your blog use mostly useful widgets. Usually the most useful widgets are category,archive,most popular,recent comment etc. You may up some creative widgets which will entertain visitors.
6.Dont use a lot of ads. You may use ads in one sidebar of your blog. You must have to remember that visitors visit your website for find his needs, not for clicking on your ads. So use ads smartly.
7.Down the menubar use a smart search box. Or use where visitor will feel comfortable.