AddThis floating bar – how is it set up?

I’ve seen the floating bar on many, many websites, including Tom’s Bike Trip and Jeff Goins, Writer. My question is how? I have the AddThis plug-in, but I see no options for setting up a bar like that.

Also, a quick question – what is the plug in for social buttons so I can link to my various profiles? Not Sociable, as it doesn’t seem to work well with my theme.