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.
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.