use recaptcha to registration?

I have seen in last days, as the discussion section is filling of spam, I think we should put some control over the users registration to avoid bots. use something like recaptcha or the other control that exist on the internet.

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I welcome any help in such efforts. Sadly I don't have the time right now.
Seems to be getting worse. Is it possible to deputize a few extra sets of eyes to delete the offending posts in the short term?
I have added recaptcha; let's see if it makes a difference. Thanks for the prodding andarms!

I will also look at enabling some users to remove spam.

And if anyone would like to contribute to PyWeek, this thing needs a user interface :)