I’m Looking For A Specific Plugin

Hi,
I am looking for plugin or page template that lists all of the categories as headings, then lists links to all articles in a given category under the heading. For example:

Category 1
– Article 1 of category 1
– Article 2 of category 1
– Article 3 of category 1

Category 2
– Article 1 of category 2
– Article 2 of category 2
– Article 3 of category 2

Category 3
– Article 1 of category 3
– Article 2 of category 3
– Article 3 of category 3

If you can point me to a pre-made block of code, it would be great. Otherwise, I am an experienced PHP programmer, so a link to a tutorial would also be good.

Thanks.