It seems some of the latest offerings on Blu-Ray are becoming quite tantalizing. I got an advanced copy of "Terminator Salvation" and the package includes "Three" discs. 1. The "Theatrical Version"
2. The "Director's Cut" (both on Blu-Ray AND lossless audio) and 3. The digital copy for PC's.

The "Director's Cut" is three or four minutes longer and I preferred watching it because it avoids all the previews and advertising that are on the "theatrical version".