Skyjedi - the grain thing is difficult. Every Blu-Ray you'll ever see has had some DNR applied to it. Period. The issue is when too much DNR has been applied.

Everything I've seen about this Alien set has led me to believe that the level of DNR applied is very sensible and minimal, and that the grain left over is a perfect amount to keep the "film" look. The possible exception to this is the third film, which (from the few caps I've seen) looks like it may have been overdone (I haven't looked at any caps of Resurrection, as I simply don't give two shits about the film).

For an example of how not to do it, look at the difference between the two releases of Predator on Blu-Ray. Now that's excessive DNR.

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About the double posts, that happens because I still don't have a proper Internet connection (it was supposed to be my roommate's responsibility if I took care of gas and electricity), and I've been tethering my Android phone's 3G Internet to my computer via USB. For some reason, it makes visiting certain sites impossible, and causes double (or triple, or quadruple) posts on forums occasionally.