Bottom line, I know what I heard. I'm not in the placebo camp. Lossless on Black Hawk Down definitely sounded better. Again, not the difference between say regular stereo and DD5.1, but still a difference nonetheless. Of course, with different movies, the improvement might be less noticeable. I've only heard Black Hawk Down. I can't comment on how much better Resistance sounds in lossless or anything else.
I'm going to buy a new Receiver with HDMI that can handle the lossless sound, but I'm looking for certain features at the right price. Right now, there isn't anything available that does all the things I want it to, so I have to sit on the sidelines and wonder how much better all these Blu Ray movies that I'm watching would sound.