This has been done for Vanilla 1 already and I have used it snice it was released. On my forum the plugin with captcha worked perfectly. Thee was no added spam or anything and I could increase the amount of comments manifold.

So I would really like to see a guest post plugin for Vanilla 2 also as soon as it comes out officially. I LOVE the new design and hope I can start using it right away when it is released. Any plans for this?