Pre-season practice viewing

Watched two films tonight to pass some time stuck at home with the ick. Out of the Past (1998) and The King of Kong (2007), both decent documentaries, both on DVD from Netflix. Watching these on disc reminded me that extras like commentaries, subtitles and featurettes are still limited to the DVD itself, and not available on the various download/streaming services (Netflix watch-it-now, Amazon Unbox on the Tivo, and iTunes rental or purchase). I'd imagine these will be made available online at some point, but I don't think anyone currently offers anything beyond the title film. Perhaps one reason that Netflix retains your online queue after watching, so that users can easily return to the site and add a DVD to the shipping queue for those extra features.