How do you get the replay data to youtube? I'd love to upload a vid and ask for the same advice, since I know I'm already out probably, just for learning experience sake.
There are a few different ways to do it...
The easiest (and ugliest) is to just use your camera, phone, or video camera to record what is on the screen during a replay. Transfer it to your computer and upload it to youtube. Done! If you're video camera uses miniDV cassettes (or any tape cassettes for that matter) you will likely need to import the raw video into some sort of video editor and save it as .avi, .wmv, etc. I use Windows Move Maker just because it's there, it's easy to use, and it's relatively fast when working with small files.
Or if your video camera has an AV-in terminal, you can feed the video and sound straight from the PS3 to the video camera, bypassing the lens and image sensor. You tend to get better image quality this way compared to recording your screen. Again, after recording, you will need to get it onto the computer.
Another method (this is what I use) is to use the AV-in terminal on your video camera and use the camera itself as a digital converter and use video editing software (again, Windows Movie Maker works fine) to capture the video. It basically makes the video camera act like a webcam, except instead of seeing whatever is in front of the lens, you get direct video and audio feed from the PS3. You don't need to record the video onto tape this way, which is one less step. Then just convert and upload.
I'm sure there are easier, faster, and higher resolution ways to do this, but my video camera is from the 480i and miniDV cassette days, so these are just the methods with which I'm familiar.