it seems that the content that catches most attention are mainstream audio and video content. the less top-ten-megastar a file is, the less likely the weasels at cogent, baytsp, etc. are going to search for it. in the long run this is going to help less well-known artists find an audience, because sharing their stuff is less risky.
of course, the safest way is to share content that is legal, which surprisingly is not just boring educationals and linux ISOs.
there's a ton of live performance recordings of popular artists over at furthur that can be legally shared. i donwloaded some content from there and am now sharing it both on furthur and limewire, these files are increasingly popular.
(
www.furthurnet.com)
and then there's the artist promotion initiatives from bearshare and more recently limewire.
there's plenty of opportunity to share cool legal content, if you do some research.
and if youre really paranoid, try
www.freenetproject.org.