POTN is a vBulletin-powered forum. One thing I love about POTN compared to other vBulletin forums is how the subscribed threads function keeps track of where I left off in individual threads.
I could have a subscribed thread that had a new post hours or days ago that I haven't read yet, but it will stay on my list until I actually visit the thread and catch up. Other vBulletin forums only seem to consider my last visit to the whole forum, and assess "newness" of posts based on that. If I keep visiting the forum, but do not get around to reading that thread, it will fall off my list unless it continues to get new entries after my latest forum visit. This is not nearly as useful. POTN's granularity is much more powerful in my opinion.
So, whoever configured it that way...thanks.