Reporting Unity game events to Google Analytics from the Unity Webplayer. Calls out to the Google javascript library loaded on the page, so the class is configuration-free.

GoogleAnalytics.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

/* Google Analytics integration. Web page must be configured for GA with Google's javascript snippet.
 *
 * Based on a comment from 2010 found here:
 * http://blog.mostlytigerproof.com/2009/10/06/gathering-statistics-using-google-analytics-and-unity-3d/
 *
 * Analytics category/action/label/value descriptions:
 * https://developers.google.com/analytics/devguides/collection/gajs/eventTrackerGuide#Anatomy
 *
 * Examples:
 *   // During app startup
 *   GA.init();
 *
 *   // Elsewhere...
 *   GA.instance.track("game_start");
 *   GA.instance.track("ball_went_too_high", "level_6");
 *   GA.instance.track("game_complete", "seconds_elapsed", (int) Time.time - gameStartedAt);
 */

public class GA {

  public static GA instance = null;

  private const string ANALYTICS_CATEGORY = "MyGameWebplayer";

  public static void init() {
    if (instance == null) {
      instance = new GA();
    }
  }

  public void track(string action) {
    List<string> args = new List<string>(new string[] {action});
    callGoogleAnalytics(args);
  }

  public void track(string action, string label) {
    List<string> args = new List<string>(new string[] {action, label});
    callGoogleAnalytics(args);
  }

  public void track(string action, string label, int val) {
    List<string> args = new List<string>(new string[] {action, label});
    callGoogleAnalytics(args, val);
  }

  private void callGoogleAnalytics(List<string> args, int? val = null) {
  #if UNITY_WEBPLAYER
    ArrayList all_args = new ArrayList(new string[] {"_trackEvent", ANALYTICS_CATEGORY});
    foreach (string arg in args) {
      all_args.Add(arg);
    }
    if (val.HasValue) {
      all_args.Add(val);
    }
    Application.ExternalCall("_gaq.push", all_args);
//  Application.ExternalCall("console.log", all_args);
  #endif
    Debug.Log("Analytics: "
            + string.Join(", ", args.ToArray())
            + (val.HasValue ? ", " + val.ToString() : ""));
  }

}

I should probably refactor this so that you don't need the init() call. Aircode:

private static GA _instance = null;

// Call with: GA.instance().track(...);
public static GA instance() {
  if (_instance == null) {
    _instance = new GA();
  }
  return _instance;
}

Disclaimer: I know very little C#, which should explain any WTFs you find.