Yes, even if you are not using social bookmarks yourself, you should implement their use on your web pages and blogs. There is a whole sector out there that can help you to promote your site if you allow for the easy tools to allow users to share your information with others.
There are several sites that allow for auto generation of the code that allows for automatic sharing versus many popular sites. If you click our post title you will go to one site that even allows for a variety of configurations.
Some social bookmarking sites give you code to install, others have easy to add Blogger or WordPress widgets, just do a web search and you will find many sites that will help to educate you on the installation and even allow you to select the services that you want to include.
Some of the hot social bookmarking sites on the Web that you will want to include for sure are Digg, Del.icio.us, and StumbleUpon just to name a few. If you have one you like to use not in my short list, just leave it as a comment below.