As far as I know, DirecTV is the only one currently carrying 3net, though a very few random episodes of some series have been available for purchase on the Playstation Network. The 3net website www.3net.com
has a schedule and description of the programming.
There are reality series, standalone documentaries, animated content, 3-D trailers, even the occasional feature film like "Call of the Wild". They seem to add new content to rotation fairly regularly. I wish they'd show some of the classic Columbia 3-D content from Sony's library.