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Downshifting it not quite so simple as just using a throttle blip on a sequential if the box is manually actuated, it's actually quite hard to unload the box under braking (or any time the throttle is shut)
I was going to write a long winded gearbox science explanation but geartronics have done a better job here:
http://www.geartronics.co.uk/blippers.htm
mcmyk-
Good article that. They've definitely made them work on bikes, they're very much the accessory du jour on current generation superbikes. It's probably easier to get them to work as the rear wheel unloads far more on the brakes than cars do and I guess it takes a bunch less energy /time to unload the drive train with a blip.
Do they use the clutch downshifting in sequential boxes in rally cars? In motocross, you just crunch down the box as it's all loose and never that heavily loaded anyway.
Jung
As far as I know they're more like motorbike gearboxes. Clutchless fine on the way up if you back off the gas or fit a quickshifter. Clutch on the way down unless you can unload the box. They fit auto throttle blippers to bikes these days for that.