For example, in the Open Dhamma section I recently read a thread on the similarities of Buddhism and Stoicism. I have also in other forums read discussions on Nietzsche and Buddhism, to give another example. Really any thread that had a philosophical leaning more than a pragmatic one, I would imagine.
Though the majority of my time spent reading involves the Suttas or some type of commentary, I have also benefited greatly from reading the works of Heraclitus, Marcus Aurelius, and other philosophers. It was therefore my intention to suggest a section for philosophy that is either focused on a different tradition (e.g. Reductionism), or on comparitive thought (e.g. Similarities between Buddhism and Idealism). I imagine it would also have the added benefit of cleaning up the Open Dhamma section a bit, so that it may hold its focus on just Buddhist related discussion.
Thanks for your interest!