Add commenting to your website
There are a few good programs that allow you to enhance the commenting features of your blog or add comments to your website. Most of them are simple to install. Just embed some javascript and the service sets up the rest. As admin you have the ability to cusomize it.
coCommerce - French only. Doesn't like Safari.
CommentSystem - An inexpensive Dreamweaver plugin.
Disqus - Many consider this to be the best, but their support leaves a lot to be desired. Broken links on their website, and slow response times. There are two versions, a free option and a premium pay option.
Echo - An impressive feature set that attempts to integrate all social networking sites into your comments platform. There are free and fee versions. It can get downright pricey if your site is used a lot. But this may be the future of all these systems.
IntenseDebate - Super easy to set up and very powerful. Free. But erratic. Sometimes replies do not post at all. Support is poor.
InstaComment - Simple barebones free system.
Polldaddy - Another way to add ratings to your site. Also does polls and surveys.
Rating System - Add ratings of products, articles, comments with this service.