eHow.com is a large website with “how to” articles on a wide variety of topics and is a good source of content ideas. They are known to have good search engine rankings and provide clues to some of the more popular topics you might create content about.
You can browse through topics by category. The category listings are found no the left side of the page:
…and more categories can be found on the website.
When you click through to a category, you can subscribe to that category via email or RSS feed. Or you can create an eHow account by clicking “Subscribe”.
You can also search for topics. Once you select your topic, you can customize your search for articles or videos.