After Lion install, Mac won't sleep (no pulsing sleep light)? This worked for me!

I know there are a plethora of suggestions out there as to how to correct the no sleep light issue since installing Lion. I tried every single one of them-- PRAM and SMC resets, looking for "little snitch" and other apps, and even trashing a preferences folder. None of them worked for me.
This is what did work. APPLE! Listen up!
1. Unplug the magsafe power cord from the computer now or in step 3.
2. Close lid to laptop.
3. Unplug magsafe power cord.
4. Wait a few seconds.
5. Watch as the sleep light begins to pulsate.
6. You can now reattach the magsafe power cord, if you'd like. It doesn't affect sleep mode for me.
After doing this, I open the lid to my MacBook and it's like old times. It takes the display a second or two to come on as it wakes from sleep. It's exactly how it should be.
I hope this helps for most if not all of you, and I hope that Apple quickly determines how to fix this problem with Lion.

Yup, pmset -g assertions will let you know what's preventing your computer from sleeping.
As for AC vs battery, there are 3 profiles for sleep conditions - AC, battery, UPS. Use the "man pmset" command to see more details. Depending on which profile is active, different conditions may or may not prevent system sleep.
I also made a small app to help with diagnosing the problem, if anyone is interested. Source code is provided. If you don't trust it, just use "pmset -g assertions".
Hope Apple fixes it soon.

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