Adding comments to any website
One of the most interesting things about blogs and other social sites is the fact that you can have a conversation via the comments area. But it's so annoying to add comments into a website! No fear. Just add this one line of Javascript code and watch the magic work. Don't believe it? JS-Kit has this free bit that creates threaded comments for any website. It's not beautiful, but hey. You're the one that didn't want to write the code!