Totally legal MP3s of your own stuff would be A-OK. :) I think they mostly look for it by volume - I've distributed a couple via here and had no problems. XD (hey, it's my site and I take responsibility if I hose it for everyone. XD)

I do know that Doctor Who episodes hosted on DH get deleted with regularity, as a certain download discussion community has found out.

I think the area of vids would be grey, but with YouTube and other video-sharing services available, there's not really that much call for private servers anymore, I think.