I can attest to this behavior. Yes the LED's blink while the laptop is sleeping under windows, but not when it's hibernating or "deep sleep".
FWIW - I'm almost certain that the LED embedded in the lid "glows" (slowly dims and brightens) when the laptop is sleeping under Windows 7.
I think deep sleep is the goal here since these laptops last about an hour before you need to run to an outlet or switch out the battery. With these DSDT hacks, I think my laptop is deep sleeping. I'm pretty sure it makes itself a hibernate file, but it's obviously confused since it's blinking it's LED's and powered USB's when it should be completely off.
OFF TOPIC but good news for our laptops, I got one of the $300 i7-830QM chips from eBay and swapped out my i5. Now I have 8 threads of power! And for those of you that don't know, you can get the internal Bluetooth unit for $15 and a 7800mah (2+ hours) battery for about $55.