I got this email today:
Hi,
My name is Michael. We are promoting [company] and want to put a banner on your blog. Please contact me on [email].
Best regards,
Michael
Dear Michael,
I am flattered that you wish to make my blog look trashy but wonder if the banner will actually help anyone. How can you get a banner right if you try get it posted to a blog with this:

in the sidebar?
Leon






