This website goes through the process of adding social bookmarks to your wordpress theme:

• http://blog.themeforest.net/wordpress/add-social-bookmarks-to-your-wordpress-theme/

This website has a list of wordpress codes for quite a number of popular social networking tools:

• http://thedesigned.com/2009/06/13/plain-text-social-bookmark-links-for-wordpress/

And this website has 30 nice social networking icon buttons you can use to make it all look nice:

• http://jwloh.deviantart.com/art/Social-me-90694011