Well what type of movies do you like? I'm slowing getting a collection going myself. Some one's recent that I recommend. If you look through the reviews section I've reviewed a few Blu Rays in there.
If your into action Hitman is a under rated gem. Looks pretty good and has grade A audio. Granted you don't have a audio system yet but its still a great movie.
No country for old men is also supposed to be extremely good although I have not picked that title up yet.
For horror 30 days of night is pretty gory and is pure eye candy. The plot is a little weak at some points but overall its a great movie. Also Resident Evil Extinction is really good. I know the first was decent the second movie sucked but the 3rd extinction was put together well and you can't beat Milla Jovovich in HD
If your into Sci Fi check out Sunshine easily the best Sci Fi that has been released lately. Some of the shots from outerspace and the sun are freaking crazy in 1080P.
Also Planet Earth is supposed to be a must have Blu Ray series. I have not picked it up yet but I really should. I've watched the series on TV already so I'm not in a huge rush. It basically takes you on a tour of the entire world with stunning shots of nature. I know it looked great on satellite so I can only imagine how well it will look on Blu Ray.
I'm really happy today though I finally got my 5 free Blu Rays by mail through a Sony promo. I had given up hope since it has been almost 4 months since I sent the redemption in.