Add This! is offering a new service that you can use to provide links to social bookmarking sites straight from your blog. Instead of having to create a button for each service (delicious, reddit, stumbleupon, etc, etc, etc), you add some javascript code for their service. Their service then allows users to bookmark your blog post to the site of their choice. The nice thing about this is you don't need to try and keep up with every new social bookmarking site out there, they take care of this for you.

Even nicer, the service is free and they give you statistics about the number of people who bookmark posts on your site as well as the social bookmarking tools people are using.