The first labels are from special series of posts. After that, the more general labels follow alphabetically. Clicking the label (rather than the post title) will take you to a page with all the posts in shortened form, with the newest post at the top of the page. You can also find labels (organized into larger categories) in the left sidebar (and listed at the end of posts just above the comments). Clicking these links also takes you to a page of shortened posts.