The particular plugin scans the entire set of links on any page of your blog while someone is watching it and it adds a JavaScript event to each of them, which upon clicking on the link (no matter is it a Left Click or a Right Click) will prefix it with the Alexa Redirect URL: in this way the person visiting your blog will visit the desired URL by forwarding the URL to Alexa. Here is an example - you have a link on your blog like yourblog.com, but when the user clicks on it, it will transform into http://redirect.alexa.com/redirect?http://www.yourblog.com/page/2. In the same time, when a Search-Engine bot like Google visits your page it will not trigger the JavaScript event, because they are not JavaScript-aware: and in this way you "Alexa-Rating boosting efforts" will not mess your Google rating and search results positions.
http://code.google.com/p/wp-alexa-redirect/
http://code.google.com/p/wp-alexa-redirect/