Bit late to this party, but I bought my second Blu Ray this week (first was The Hurt Locker)...
Baraka
It's just insane, shot on 70mm film in 1992, easily the best looking thing I've ever seen on my TV. Don't worry too much about the spiritual side of it if that isn't your thing (I generally can't stand that kind of slant, prefer nature films myself), it's spine tingling stuff.
Missus generally has no interest, but she just sat silently watching, great
review here, basically the transfer is way, waaaay beyond the capabilities any technology we have in the home.
[youtube]YaW4AskXADQ[/youtube]