I can tell you that it is 100% for sure that you can send 1080p over component.
I will add:
Just like you are not allowed to upconvert DVD video to more than 480p over component video connections, Blu-ray Disc is limited to 1080i video output over component video.
In fact, almost all analog component video sources never are put out above 1080i video over component even though it is possible to do so.
One of the only, potential, exceptions may be gaming on the PS3. I'm not positive, but this may be possible at 1080p over component video. I would not swear by it and haven't tried it as I'm using HDMI for my PS3 connection right now.
It is extremely rare to see 1080p component. So rare, that it is very close to right to say component doesn't support 1080p. But, more accurate to say that you can't get 1080p from Blu-ray, DVD, or any cable box I'm aware of over component.
Rivrbite - check my follow up response to this over at bigscreenforums.com