I really don't think there's much point in keeping an eye out for Apple's patent filings, because I've never really seen any of them being utilized in actual shipping products (except when you find out about them after they've been introduced in a product), but it's our duty to bring them to your notice when we come across Apple patent filings that pique our interest.
The latest one to do so is a patent filed by Apple in July 2007 that describes a way to integrate an iSight camera actually
Frankly speaking, I have no idea how that would work, which is why it's probably good that I'm not an engineer of any sort. But it does sound like a great idea and its demo would be quite a sight (pun unintended) if Apple actually pulls something like that off. But, like I said, I don't remember ever hearing about some Apple patent and then seeing it come to fruition, so I don't have high hopes about this either.
This story, "Apple Files Patent for an ISight Behind a Display" was originally published by Macworld.