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Disqus are continuing to innovate in this space, and today they're rolling out a new feature on all Disqus blogs, including Mashable: the ability to Sign In with Twitter and cross-post your comment to your Twitter stream.
Disqus already has the ability to cross post to Twitter if you have a Disqus account already. And if you comment on multiple blogs, that still might be the best way to set it up. But if you just want to quickly leave a comment on Mashable and have it shown to all your Twitter followers, Disqus makes that super easy with a big "Sign In with Twitter" button.