Make a discussion site on blogger
4 Jul 12
There are lots of good blogger template out there which you can choose for your discussion blog. I don't know what is your taste when it comes to template design so I am just going to provide you a link: http://btemplates.com/blogger-templates/rounded-corners/ it is a site where you can find lots blogger template including magazine style, simple, wordpress style, Web 2.0 style, and so on. So enjoy.
15 Oct 12
A discussion site on Blogger? Check ShoutMix or Disqus. Will those satisfy you enough? But if you want to create things that more like forum, you'll need to host it separately. You won't be able to embed it on Blogger. I recommend vBullletin or phpBB for the free forum scripts.
9 Sep 11
I seem to remember having this discussion before, though I'm not sure who started it. Forums (i.e. discussions) are different to blogs and need to be hosted separately. And yes, if your next question is about free forum hosts, I remember also posting that link (http://www.lmgtfy.com/?q=free+forum+host). You could possibly put a ShoutBox on a Blogger blog, though I've never tried.