AddThis - #1 Social Bookmarking Sharing Button - Del.icio.us Digg Facebook Widget is the plugin.

It's nice in that it gives stats, but it seems to slow down the pageload noticeably because it's referencing a busy site... it came up high in my google search for social bookmarking gizmos.

I needed it in a hurry. I'll stick with it for a while and then look at finding other options if I need to.