The AddThis widget is a way for your readers to bookmark your website on pretty much any social bookmarking service in existence, as well as being able to save it to the browsers local bookmarks. The widget setup page is easy to use and you can quickly generate code for websites, blogs, MySpace page, and even an ezine or newsletter.
Adding an AddThis widget to a website or blog can help to reduce the clutter on a site, so you don’t see a huge list of social bookmarking icons at the bottom of every page. Your readers can easily bookmark the page using the social bookmarking service of their choice. You can gain some insight into what readers save with the statistics that AddThis gathers, and probably the nicest feature, it is free.
Overall the AddThis social bookmarking widget can save some valuable screen real estate on your website while still giving your readers the benefits of saving the pages they like to the service of their choice. I am sure they will work out any errors that they have soon. They also have an RSS version of the widget as well that could be just as useful.