A couple of years ago I posted a video on YouTube demonstrating a few minutes of video playback of The Dark Knight Blu-ray on an Atom machine, showing that it played cleanly.
http://www.youtube.com/watch?v=VmgxSxb6prM
A little while later, I got a notice from Warner Bros indicating that they were aware of the video... and that's it. They didn't actually ask me or YouTube to take it down. It's stayed online ever since.
Hm... what's surprising is that it looks like they didn't even try to monetize the video. I've made WoW videos where I used third party music (as is fairly common in them), and they usually get monetized for the music artist. I don't mind as it's not like I asked permission to use the music. However, that doesn't seem to matter as people have had their stuff flagged even when they have permission.

Anyway, my only concern is that companies don't seem to understand that the exposure can serve as "free" advertising/outreach. I talked about my own WoW videos, but what's worth mentioning is that I found out about a good number of electronica artists and/or songs from
other WoW videos. If I liked the song, I would usually go and buy the song or the whole album (I hate having a single track). Some of the artists that I used in my videos were the ones that I first heard in other videos.
Is it ever going to be an easy, clear cut system? No way. It's just too hard to police the sheer number of videos that YouTube gets. It'd just be nice to see companies seeing that there
can be some good that comes out of it.