Interesting. Assuming you're using v2, I think there might be a very elegant solution: write a plugin which overrides the default protocol handling implementations of the links plugin. Allright, that may sound scary, but it really isn't.

Basically you could create a plugin named "googleanalytics" or so, which depends on the "links" plugin:
public class GoogleAnalytics extends AbstractPlugin {
public function GoogleAnalytics() {
super("googleanalytics", "1.0.0", [new Dependency("links")]);
}
}
Then write the custom handler (just copy the default one from the links plugin and extend it with the tracker functionality), e.g.
/**
* Google Analytics enabled handler for http and similar urls (common protocols that can be
* handled by navigateToURL).
*
* @param url
* the url to navigate to.
* @param source
* optional, element triggering the link.
* @param target
* optional, used e.g. for http:// links.
*/
private function trackingHandler
(url:String,
source:IElement =
null,
target:String =
null):void { target = source
? getElementProperty(source, "target")
: target;
if (!target) {
target = "_blank";
}
tracker.trackPageview("/Megazineclicked"); // <-- what you wrote, I don't know the ga API ;)
}
And finally, in the registration phase of your plugin, override the handlers , like so
override public function register(manager:IPluginManager, megazine:IMegaZine, settings:ISettings):void {
super.register(manager, megazine, settings);
var links:ILinks = pluginManager.getPlugin("links") as ILinks;
if (links) {
links.registerProtocol("http://", trackingHandler);
links.registerProtocol("https://", trackingHandler);
links.registerProtocol("ftp://", trackingHandler);
// And what else you might need / want to track
}
}
And that would pretty much be it...
Would love to hear if it works, and if it does, posting the plugin to the user contributions section (or in the project wiki) would be appreciated

If all your links are in your swfs and not linked elements that won't work, though. You might consider letting them use the links plugin to handle the links, though, then it would.