Integrates Vanilla Forums with WordPress: embedded blog comments, embedded forum, single sign on, and WordPress widgets.
This is one of the best forums that I ever see and works great on wordpress.
My only complaint is that the forum is a little complicated.
Before you think plugin is broken, make sure the issue isn't your host. If you are getting "Couldn't find a Vanilla Forum at this url :/", it has to do with your server and access to curl. This post at the Vanilla Forum explains it best:
This is a subscription service. Do not download unless you plan to sign up and pay monthly for it!
This plugin is only an attempt to get you to sign up and should say so before downloading. I am so sick of these that I have just created an account to start giving feedback ( I know that I should have been doing all along for the benefits of the community but I am lazy by nature ). Don't download unless you want to sign up...