Changes in how Google Reader creates the "shared" web pages that I use for the topics here have caused some problems. I'm working on getting stuff to work again.
The best bet is to use your own news reader and subscribe to the topics that interest you. That feature works as before. As I review the content in my reader, the feeds will be automatically updated.
Displaying the topic content here works -- sort of. You will notice coding issues and other intermittent problems. These should be easy enough to fix but getting the time to work on the problems is proving difficult.