With the success of Stack Overflow we also now have Stack Exchange.   The technology driving these sites is nothing ground breaking.  Lots of people make nice usable websites on the same platform.

These guys have revolutionized the Wiki.  The community concepts that drive this technology is indeed the next killer app in information technology.    Its the first of its kind, and will be mimic for years to follow.  The list of sites using this technology is growing daily and has no limits.

As you see in this post, I am linking to the most popular Wiki, Wikipedia.