Well, PDTV/HDTV-rips are afaik almost always progressive (they are IVTCed and frame decimated at encode time). Most stuff gets shot on film these days, and I love it. :)
I dunno how the groups do hybrid stuff, say like Enterprise which iirc is shot on film but with CG-stuff done at different specs. I forget the specifics, but there's an odd mix there somewhere. I don't watch Enty anyway, so I really don't care. :p