A bit late to the party, but I just realized Google has made these amazing captcha-free captchas:

I just installed this wordpress plugin, and it seems to work fine so far:

Sure, there are some privacy concerns etc with this approach, but i just hate traditional captchas. Besides, Google probably know everything there is to know about me already anyway 😛
Still, if you want another alternative, this is also quite a good solution:

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