I recently had an advertiser that wanted to place an ad on one of my other blogs. I gave some him some options and prices, but what he really wanted was something I didn't think was possible. He wanted a link in my sidebar, but he just wanted that link on the home page of the blog and not on all the other pages. I'm not sure exactly why he wanted that, maybe thought it would cost a bit less?
Whatever the reason, I had to tell him that I didn't know of any way to do that. Whatever is in the sidebar is on every page and post of the blog. That's just how it is. So no ad. Then I read this article the other day that explains how to have some of your sidebar content on the home page only. I don't know how she figured out that it was even possible or how to do it, but I'm definitely saving these instructions so I can do it if anyone asks again.
Besides ads, what other reasons would you have for showing some sidebar content on just the home page and not the rest of your blog?