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@bq
Sturmey Archer have reintroduced a dynamo hub - Incidentally 'Dynohub' is a Sturmey Archer trademark
http://www.sjscycles.co.uk/product.asp?pf_id=12778&src=froogle
This is the X-FDD with front brake as well.
I have no idea if it's using the old dynohub tech or something more modern, but I'd be interested to see a comparison featuring both this and the old GH6 compared to the Shimano and Schmidt versions.
The old GH6 (or AG/FG geared dynohubs) have completely undetectable drag. All this talk of it being like going up a hill seems alien to me. How can Shimano copy something and then make it worse?
The Sturmeys also came with the options of two sorts of battery back-up. One (the dry battery unit, or DBU) was manually operated by the switch on the lamp, and the other (the Filter Switch Unit or FSU) automatically switched to battery back-up when the power dropped below a certain threshold. Again you could use the switch on the lamp to enable or disable this unit.
Do the modern equivalents offer anything like the FSU?