Mark_Lenovo,
That's very helpful advice.
I had a dream that I took my laptop apart, and found this:
I didn't find any issues with the seating, nor any cable issues.
There is a small black tab on the upper right, that is a physical extension of the top of the palmrest). It appears to be part of the keyboard support. It's not touching the magnesium underneath, so there's a bit of flex if you push on it. I don't know if it should be seated against metal or not.
I didn't want to unplug the keyboard, as i'm not familar with the connection type. It might be a tiny bit bowed but i wouldn't feel comfortable trying to straighten it.
Then I woke up, and was thankful that I didn't risk my warranty by doing this IRL. 
Mark_Lenovo wrote:Erik,
Thanks for the great write up and the youtube video. Hopefully, you'll expand your review to look beyond the keyboard as you spend some more time with the system... I think we'd all be interested in your ongoing thoughts.
In the mean time, let's explore your keyboard observations....
In the past we got a lot of feedback on this, but the focus was always on the left side of the keyboard where there was initially a lot of clear span area, and the reduced weight keyboard, sans stiffener plate from earlier T61 keyboards would tend to flex there. (August 08-Nov 08 builds were the time we heard the most on this). Starting in Nov '08, we shifted manufacturing to use the T61 keyboard while an update / enhancement was developed.
In April '09 and onward, we returned to using the weight reduced keyboard, but added support brackets inside the system to reduce flex / improve the feel on the left side. Very rarely were there any complaints with the right side of the keyboard because there is so much support from the magnesium roll cage there.
Since your system is showing flex on the right side, I have to suspect one of the following things may be a possibility:
1) The keyboard is not properly seated in the system. The rollcage casting (magneslium) has a couple ridges toward the bottom (palm area) of the keyboard tray. When the keyboard is installed it must be pushed down and slid under the bezel below the LCD. If it isn't forward enough, a corner could be resting on this ridge, causing the keyboard to sit high on the right side, and creating the hollow area underneath. Try removing the 5 screws on the bottom with the keyboard icon next to them - remove the palmrest and check the keyboard / reseat it.
2) The keyboard could be slightly bowed. While you have the system apart from my suggestion in #1 above, remove the keyboard (careful with the ribbon cable) and visually check to ensure it is not warped. You can form it slightly with your hand if needed.
3) Lastly, while you have the keyboard out, check the area under it for any wiring that might not be tucked into the appropriate recessed channel in the roll cage. Some of the wires may have paper labels and if one is folded and sticking up, it could prevent the keyboard from seating properly.
Mark
Hi erik_h,
You won't void your warranty by removing the keyboard* -- it's considered a "CRU" (Customer Replaceable Unit). The Hardware Maintenance Manual has instructions, and you can watch a video at:
http://www.lenovoservicetraining.com/ion/
Maybe someone else can comment about the small black tab... it's not ringing a bell in my attic.
Hope you can re-seat your keyboard to get a firmer typing experience.
Best regards,
Frank
* Edit: You probably don't have to unplug the ribbon cable, just to re-seat the keyboard. I guess you already found that out. 
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