In a non-widgetized sidebar you may have content that you only want to show on certain pages but not on others. I started thinking about this after my (Anti) Social WordPress Spring Cleaning article where Ajith mentioned that on my portfolio page I was duplicating the testimonials. I had the testimonials listed with each project and in the sidebar.
So, I decided to use conditional code to only display the sidebar testimonials on particular pages. This part of my site uses a different sidebar than the blog. You can see the testimonials on the About, Services or Contact pages but not on the Portfolio page.