Here is the recording of the Big Business class 2nd training:
Here are links to some of the plugins I mentioned:
for forums: BBPress
for communities: Buddy Press
for q and a: CM Answers Pro
for advanced search on your site and views-type presentation on your site: wp-types
As discussed on the call, I’m not recommending you use much more than this, except for very specific circumstances where you have determined you want a certain functionality. The more plugins you run, the slower your site can run, and when you scale big, that can be a problem.
Keep your site simple, use only what you need.
The 4 plugins on this page will make your site a world-class site!