Query the Google Analytics account feed to get a list of available sites

gistfile1.cs

var authFactory = new GAuthSubRequestFactory("analytics", ApplicationName)
          {
            Token = settings.SessionToken
          };
var analytics = new AnalyticsService(authFactory.ApplicationName) { RequestFactory = authFactory };

foreach (AccountEntry entry in analytics.Query(new AccountQuery()).Entries)
{
  var account = entry.Properties.First(x => x.Name == "ga:accountName").Value;
  if (!model.Sites.ContainsKey(account))
    model.Sites.Add(account, new Dictionary<string, string>());
  model.Sites[account].Add(entry.ProfileId.Value, entry.Title.Text);
}