Was doing some reading online and found this little piece of code to remove blogger.com's top navigation bar (or called navbar).
Login to your blog. Go to template, find, Edit HTML. In there, copy and paste these codes between the head and variables section in this link: http://blogger-templates.blogspot.com/2005/01/remove-navbar.html
Please note, this is blogger.com's way of promotion, and blogger provides a decent set of blogging service without much ads etc for Free. So, before removing, ensure you give back something to blogger.com like me, i have their logo in my blog :)