I remembered this product from goodie bags from a number races--Wasatch Back, Moab 1/2. I went and found one of the samples and decided to give it a try. I went on the website to see the proper application. I'm pretty sure I was experiencing "runners knee". From the online Runner's World magazine: "It occurs when a mistracking kneecap irritates the femoral groove in which it rests on the thighbone."
I applied the tape (is waterproof so it can be worn in the shower or to the pool without coming off, and can be left on for up to 5 days) as directed. Stepped down, walked around and there was no more pain. Amazing.
I don't usually get a lot of aches or pains other than the general muscle soreness that goes away in a couple of days, so I haven't thought about this issue before. I'm a believer now. I'm going to run my next long run (20 miles) with the tape actually applied to the knee to support it and see how that feels after.
I love this product and I'm going to go out and buy a roll at the new Salt Lake Running Company store ASAP! Hopefully I won't have much use for it, but when I do it will be worth every penny.
FYI, I've priced it out around $12-14 a roll with 20 applications per roll.