diff --git a/src/HPCloud/Services/IdentityServices.php b/src/HPCloud/Services/IdentityServices.php
index 492e03f..ac103d4 100644
--- a/src/HPCloud/Services/IdentityServices.php
+++ b/src/HPCloud/Services/IdentityServices.php
@@ -122,9 +122,14 @@ namespace HPCloud\Services;
  * - tenants()
  * - rescope()
  *
+ * <b>Serializing</b>
+ *
+ * IdentityServices has been intentionally built to serialize well.
+ * This allows implementors to cache IdentityServices objects rather
+ * than make repeated requests for identity information.
  *
  */
-class IdentityServices {
+class IdentityServices /*implements Serializable*/ {
   /**
    * The version of the API currently supported.
    */
@@ -171,6 +176,8 @@ class IdentityServices {
    */
   protected $catalog = array();
 
+  protected $userDetails;
+
   /**
    * Build a new IdentityServices object.
    *
@@ -687,6 +694,7 @@ class IdentityServices {
 
   /**
    * @see HPCloud::Services::IdentityServices::rescopeUsingTenantId()
+   * @deprecated
    */
   public function rescope($tenantId) {
     return $this->rescopeUsingTenantId($tenantId);
@@ -824,4 +832,24 @@ class IdentityServices {
     $this->serviceCatalog = $json['access']['serviceCatalog'];
   }
 
+  /* Not necessary.
+  public function serialize() {
+    $data = array(
+      'tokenDetails' => $this->tokenDetails,
+      'userDetails' => $this->userDetails,
+      'serviceCatalog' => $this->serviceCatalog,
+      'endpoint' => $this->endpoint,
+    );
+    return serialize($data);
+  }
+
+  public function unserialize($data) {
+    $vals = unserialize($data);
+    $this->tokenDetails = $vals['tokenDetails'];
+    $this->userDetails = $vals['userDetails'];
+    $this->serviceCatalog = $vals['serviceCatalog'];
+    $this->endpoint = $vals['endpoint'];
+  }
+   */
+
 }
diff --git a/test/Tests/IdentityServicesTest.php b/test/Tests/IdentityServicesTest.php
index d624e04..29e0761 100644
--- a/test/Tests/IdentityServicesTest.php
+++ b/test/Tests/IdentityServicesTest.php
@@ -314,6 +314,33 @@ class IdentityServicesTest extends \HPCloud\Tests\TestCase {
     $this->assertNotEmpty($user['roles']);
   }
 
+  /**
+   * @depends testAuthenticateAsAccount
+   * @group serialize
+   */
+  public function testSerialization($service) {
+
+    $ser = serialize($service);
+
+    $this->assertNotEmpty($ser);
+
+    $again = unserialize($ser);
+
+    $this->assertInstanceOf('\HPCloud\Services\IdentityServices', $again);
+
+    $this->assertEquals($service->tenantId(), $again->tenantId());
+    $this->assertEquals($service->serviceCatalog(), $again->serviceCatalog());
+    $this->assertEquals($service->tokenDetails(), $again->tokenDetails());
+    $this->assertEquals($service->user(), $again->user());
+    $this->assertFalse($again->isExpired());
+
+    $tenantId = $again->tenantId();
+
+    $newTok = $again->rescopeUsingTenantId($tenantId);
+
+    $this->assertNotEmpty($newTok);
+  }
+
   /**
    * @group tenant
    */