Tech-PC.co.uk has posted an Socket A Heatsink roundup.

In order to give the coolers a hard time I have also decided to test all the coolers with the CPU overclocked to 1915Mhz running at 1.92v Vcore, which makes this one extremely hot CPU and very hard to keep cool and stable. Using this method we will really stress the heatsinks cooling ability and only the best will cope. Also as temperatures do not always mean everything I have also decided to do overclocking test with each heatsink and fan
configuration. Basically this will involve me overclocking the CPU to it's maximum stable speed at 1.92v, obviously once again the better the heatsink is, the more the CPU will overclock and remain stable.

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