I mentioned I was willing to create such a plugin, I was even cobbling the code together.
Then I noticed a mention over on Matt’s blog (just search for Matt) in the comments that somone had written one.
Wikipedia Nofollow Plugin
And here is a link to Wikipedia to test it
Edit: after posting I grabbed a screenshot

Oh and I submitted it to Digg
Lol, ok so the “Digg This Plugin” is seriously screwed. I link through to a Digg I made for the original blog post, and the original author – in the comments I posted a link to here as an example of it working. Digg this now thinks I have votes for this post, and the button actually seems to link through to the digg on someone elses blog. Weird…
Someone has created a more secure “Digg This” plugin called “Digg That”, which apparently cures the problem, I will give it a try.
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[...] Must give full link credit to Andy Beard for pointing out this new Wikipedia Nofollow Plugin, if you got a Wordpress blog using it is the right thing to [...]
[...] Andy Beard was good enough to write it up and promote it around a few websites. In addition, he also pointed out I had a bug in my comment [...]
[...] you are a blogger and using wordpress there’s already a plugin wich adds nofollow to all link pointing TO [...]
[...] might want to retro-actively add nofollow to links you have given freely in the past. As an example some time ago I started using the nofollow Wikipedia [...]