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Its a windows program so the only way to do this is to boot your mac into windows using bootcamp, or use virtualization, i.e., vmware or maybe even crossover

Please be aware that crossover only works on some apps, its not a perfect solution.
 
Is their another program that can be used as a substitute for Wincap?
The reason i wanted to use it, is that i wanted to use Firesheep on my network, to see how it works with Firefox 3.6. The idea behind this is that i have a website where i show people how easy they can loose for example, their Facebook account from Firesheep and how to protect themselves by using https instead of http.
 
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