Product review (5 stars): Fixed my dishwashing problem
This part and 15 minutes of work repaired my 2010 Kenmore Elite Ultra Wash dishwasher (model 665.1312*).  For those of you who are not confident about repairing a dishwasher, read along because I wasn't either but this part was easy to replace.

After two years of stellar cleaning, our dishes suddenly starting being consistently dirty after the wash ended.  Since the problem occurred spontaneously and we had previously had great performance, we knew something was wrong.  Some online research suggested that the problem could be that we didn't have enough water running through the cycle, and sure enough if we opened the dishwasher 10 minutes into the cycle, there was only a little water at the bottom of the washer.  Normally the water should be about 1/4" below the heating element.  Online forums said that problem is usually fixed by replacing the inlet valve.

I'm not terribly mechanical but I figured I could at least take a look at my washer.  I unplugged my washer and turned off the water to it.  I removed the screws on the access plate at the bottom of the washer, and I opened the door and removed the two screws at the top of the washer that attached it to my counter.  Then I pulled out the washer and was able to see the inlet valve on the front left side of my washer.  I unscrewed the hose coupling, unscrewed the hex screw that held the inlet valve to the washer frame, and slide off the washer.  Finally I gently pulled off the electrical plug to the valve and took off the rubber hose.

The part number on the inlet valve was this Whirlpool inlet valve model, so I order this from Amazon and replaced mine.  I hooked everything back up and my water level is now correct and my dishes are clean again.

I ordered second day air and placed my order at 10 am CST, and my package arrived the next day!  My local plumbing supply didn't have it in stock and were more expensive anyway (even including Amazon's 2nd day shipping and sales tax.)  Gotta love Amazon.