Is there any way to put videos off the internet on my PS3's HDD?

One of my favorite things about my PS3 is the web browser (this is one of few times that I am NOT using it) and my favorite thing about the web browser is that I can save images to my HDD and set them as wallpapers. I can also download a podcast to the music section off the browser. One thing, however, that I have not been able to do is download videos off of websites like gametrailers. Is there any possible way to do this and can it be done without attaching it to my PC?

Some games have that feature...

Uncharted 2 is supposed to have that feature. Still I'd like to know if I could download videos off the web browser.

That has nothing to do with Uncharted 2. The fact is that you can go to keepvid.com and paste the link of the page which has the video in and it'll download it. But since it's a format which isn't compatible with the PS3 it won't read it. So you'd need to download it on the pc, convert it and then put it on the ps3.