C. Rose,
The first thing I can think of is that you try clicking on "what's new" at the top of the page. That shows the most recent postings for all categories.
Another suggestion: If you look at the very bottom of this page, there's an "Archive" link. There, you can select a category (main, pictures, etc.) Those lists will give you the topics (threads) in each category, with the newest started topics at the top.