How to: Show many nodes of a specific content type as block?

Hi, I'm trying to make it easy for staff to input content, so I created a content type called "testimonial". This has text, an author and a company.

I would like to know if it's possible to create a block that takes a set number of nodes with the testimonial content type.

So in essence, it would show for example, 3 testimonials in a block in the sidebar.

Is this possible? Or am I thinking about this the wrong way?

Thanks in advance.