Yeah, just did a bit of Googling and everyone seems to love them.
There's the Lectron, and also the APT Smart Carb, which is the same idea. The Smart Carb comes in a billet version ($$$) and a cast version (cheaper). I think maybe I had heard about problems with the cast Smart Carb, so not the same thing.
Anyway, sounds like the good ones are around US$500. For the amount I get to ride, I think I can put up with running a bit rich now and then. Or I could just not be lazy and rejet when necessary.