Update: Please view "Automated lists by topic," a more-recent post, for clearer instructions about how to build lists of posts that grow as you publish new posts.
Edits I've made in response to changing technology have rendered the below report more difficult to follow.
Online stuff changes from time to time, and for this topic my revisions have proved awkward.
Read more about archived posts, if you like.
If you use labels to characterize your posts (and you should, it is a very handy way to organize your blog), you probably know how each label groups those posts together by category on separate label-search pages.
But wait, there's more.
You can list all of the posts with the same label in your sidebar, sorted alphabetically if you like, or in chronological order, oldest first.
For instance: All your recipes. Your 2010 trip to Italy. Your beer reviews. Whatever.