IGH, Alfine, Rohloff, Sturmey Archer and frames/bikes built for them...

I'm thinking complete bikes, something you can buy and ride straight away, but IGH frames are all good as well.
The thing is IGH's should be a bigger part of the commuter market, but you need there to be more choice in the market for that to happen, and you only get more choice if there is more demand, but you can't get more demand, if no one knows they are available, etc etc etc....