I was stewarding a couple weeks ago at our club's agility trial and was quite taken with the colorful fleece collars that some of the agility competitors were using. They were martingale collar/leash combinations. Thanks to Melinda at Exercise Finished, I was able to find the exact collar I was looking for at Genuine Dog Gear. So now I have about 506 collars and leashes!
Here's Jackson in his new "padded martingale tug leash" : )