the Alexa toolbar is only good to use a a very general gage to see how your site is doing. I would put as much weight on the Alexa rankings as I do in gogle's PR (BTW, I put little weight on PR, probably a lot less than most link traders). Neither ranking has anything directly to do with how good your site is, how much it is helping or driving your business, or how much search engine traffic you get. Instead. rely on your server logs and sales to determine how effective your site is.