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I don't recommend Proboards simply because if you want to move to self hosting, you won't be able to get your database and you'll have to start from scratch. If you're wanting free forum hosting for your site, jcink is better since they allow database back ups. Also if anyone does want to get into blogging and having a community attached to your blog, I recommend checking out which forum software have bridges to connect your Wordpress blog with your forum. Xenforo also has a blogging package you can purchase along with the license for their forum software, if you want to go down the paid software path.
