I hope Spectre et al won't be cross with me for posting another thread on Superbit DVDs (as he keeps saying, please search for "superbit" on the forums and FAQ for a description of what the technology is etc).
If any of you are really Techno-trousers, you should take a look at this thread from another (US based) AV Forum.
http://www.avsforum.com/ubb/Forum30/HTML/000799.html
The main guy Bjeorg Roy is a kinda God-like figure to some of them, but he does seem to have a somewhat (shall we politely say!) precise approach to reviewing the potential visual improvements of Superbit.
As some people on these forums have said they can't tell the difference in visual quality, this string may be of interest for an alternative view (the ability of the hardware itself perhaps?).
Anyway, I'd like to try them myself - I just wish I lived in the US so I could get that 5 disk/title superbit package for $80 from Costco!!
Simon