Urgh...batteries suck

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@ Kenny...

Kinetic torch, my mate

http://shops.bizarsoftware.com.au/ATAShop/catalogue/category16/category78/product174

The mode of operation may remind many users here of their first sexual experience, but the benefit is definite light at the end of the tunnel and no need to buy batteries. Gets you out of a fix at least... :-D

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@ Blobzie

This one here will give you a run for your money in the humming stakes:

http://www.lboro.ac.uk/research/susdesign/InfoInsp/Inspiration/alternate-energy/baygen-torch/baygen%20torch.htm

It's also good for those who don't feel comfortable with the 'shake' motion, or for ladies (whose shake muscles are not as developed)  :-P

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@ Blobzie

That headgear looks like something a 1930s gynaecologist would have.

I think the wind-up torch is probably the best of the bunch.
Tritium-coated sights can still be found on many tactical small-arms, but obviously in much smaller quantities than you would have on your bicycle.