Auto-Blip. Downshift rev matching made easy. Sounds way too good to be true.
I have just spent the last two hours reading about this product on BossMustangsOnline.com and a couple other forums and thought this was genius. Heel-Toe technique is very hard to get right, I have been practicing the past year and it has barely been working. Braking, downshift, and trying to rev-match at the same time while coming to a corner at 100+ MPH is fairly hard to do. This product seems to do that for you, which I am trying hard not to order right now. Pretty much, if my car didn't crap out cylinder #8 I will be putting this on my car before the road course season this March.
http://auto-blip.com/index.php?route=common/home
I don't work for these guys, but the Boss302 guys seem to be swearing by them.