I just unplugged my headphones from my laptop, and the Win7 sound tool gives me 2 separate volume bars. One for headphone and one regular one. The only time I've ever seen this happen was when having TeamSpeak installed on an older computer of mine.
Now, some flash videos are on headphone, others aren't. Same for various applications. Totally random.
No idea at all what triggered this. Anyone have any experience with this?