Well it doesn't show how many other sites are competing for that keyword and neither it gives you back linking information, but i can recommend you can go with SEO Quake tool, basically it is an add on that is installed in your browser and tell you the
PR, total back links, ranking etc. of the particular website that you are visiting, however it cannot provide you with overall result! Search over the internet for such type of tool, as you might find something useful!