Check out this free keyword tracker http://www.digitalpoint.com/tools/keywords/ You can sign up for a free account and it will track your keywords in google and let you watch your position change over time at a glance..
What Is A Google API Key API stands for (Application Programming Interface) which is ( a representational state transfer.) It is a key allowing you to access different company libraries that will return information back to you in a language you can understand it. Think of it as a library of data and services that you can access if you have the right key and you can use these services from the library to access information. You can get a code from this site: http://code.google.com/intl/nl/apis/maps/signup.html