Disqus is a pretty neat little comment system. Does it have the ability to be turned into a full-blown community forum. Has anyone managed to successfully hack/customize Disqus in this way?
I have personally never used Disqus on a web-developer/administration level, but as a user (reading + posting) on several Blogs such as Notch's Minecraft Blog (oops he disabled commenting!), I've noticed that it tends to have some serious issues handling large amounts of users/posts. The most apparent issue is the random disappearance of comments, particularly when multiple pages of comments were involved. Also, threading comments across multiple-pages is a nightmare, especially when you're nested even just 3 deep and then have to jump to the next page - good luck following the previous train of thought! My fear is that creating a community forum based on Disqus might put you on a sinking boat sooner than later.
Other than that I can only comment on an even more personal level: I find it rather shallow, in particular that it supports more of this horrible, unrealistic circle-jerk behavior - similar to the Facebook Like button - or rather, where is the bloody dislike button?! Answer: There is none. Enjoy the ego-stroking kiddies!
We made a one at http://forum.mctraveler.eu/
It is simple visitors can create threads/posts which then will be threaded in the disqus style.
You can copy it, you will need to save the index.html and forum.js. Change the shortname and API key. Then all you need is a better design and you are ready to go.