Using categories

Wikipedia articles are placed into categories. You can see these categories at the tail end of every article. These categories are arranged into a hierarchical tree.

Try going to an article related to your field. Scroll to the very end. You'll see a list of categories. Choose one, and you'll see a list of subcategories and related articles, sorted alphabetically.
Scanning through these categories can be a quick way to find interesting articles. As you skim through, you can evaluate the article to see what can be improved.
Categories also offer a good idea of articles you might want to create.