I've had this old favourite for a couple of years:
http://www.wiggle.co.uk/ProductDetail.aspx?Cat=cycle&ProdID=5360025760&N=Cateye%20EL410%20Front%20Light
It clips on and off very quickly and is pretty bright too.
And if you mount your lights upside down on the handlebars, they don't look quite so shit. Stops them tilting forward when the straps not tight enough too.
@bracestower started
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I've had this old favourite for a couple of years:
http://www.wiggle.co.uk/ProductDetail.aspx?Cat=cycle&ProdID=5360025760&N=Cateye%20EL410%20Front%20Light
It clips on and off very quickly and is pretty bright too.
And if you mount your lights upside down on the handlebars, they don't look quite so shit. Stops them tilting forward when the straps not tight enough too.