Prototype is a javascript library that allows easy AJAX implementations to enhance your website. With a couple of script calls, and class inclusions to your website you can easily access php scripts to read, compute, and return particular results. For instance an html <form> element can be used to capture data, and an AJAX call can be used to access php to compute, return, and display the results without reloading the webpage. The AJAX call can take the form data, access a database, or do direct storage in flat files. The first step is to read up on the prototype package, and see some examples in action.
The prototype library can be found here.
An excellent introductory example of prototype in action can be found here.
And a powerful AJAX project, using protype and other libraries is lightbox!!!
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Statcounter is a free and paid statistical service for websites. You simply insert a snippet of javascript code, to the header of your website, and you can now access statistics on the statcounter.com website. The only drawback to this serice is that it uses javascript, and there are many internet users that either don’t have javascript, or they have purposefully disabled it for security reasons.
Google Analytics does not use javascript therefore it is a greater degree of accuracy. It also provides much more specific information that really provides an excellent overview of a websites status.
There are pros and cons to using one or the other. Statcounter is real time, which really cannot be beat. It is very handy to access information, practically instantaneously, as required. While Google Analytics does provide substantially more information, the data is delayed some time.
Overall there is no way to say which one is better, they both have there beneficial uses! 
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